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James Holden (engineer)

From Wikipedia, the free encyclopedia

James Holden (26 July 183729 May 1925) was an English locomotive engineer. He is remembered mainly for his handsome and effective Claud Hamilton 4-4-0, his pioneering work with oil fuel, and his unique Decapod, noted for its incredible acceleration.

Contents

[edit] Biography

James Holden was born in Whitstable, Kent on 26 July 1837.[1] He was apprenticed to his uncle, Edward Fletcher and, in 1865, joined the Great Western Railway, where he eventually became chief assistant to William Dean. In 1885, he was appointed locomotive superintendent of the Great Eastern Railway, which placed him in control of Stratford works[citation needed]. He held office from 1885 to 1907 and was succeeded by his son Stephen (19081912), who enlarged the Claud Hamilton type into the capable 1500 4-6-0 design.

A Quaker, Holden had little regard for trade unions and believed employers should spontaneously look after their men. He played his part by erecting the first hostel (1890) for enginemen arriving in London with late trains from the provinces, and by providing commodious side-window cabs.

Holden's first oil burner of 1893, Petrolea, was a 2-4-0 and burned waste oil that the Railway had previously been discharging into the River Lee. (This is disputed in [1].) It was largely inspired by Thomas Urquhart's success in Russia and was eventually followed by more than a hundred additional oil-burners. (Again see [2].)

He died in Bath on 29 May 1925.[2]

[edit] Locomotive development at the GER

(Allen 1961) notes that:

"While to some extent his work consisted in improving the designs of his predecessors, Holden was responsible for several noteworthy - designs of his own. But his outstanding genius was seen in the complete reorganisation of Stratford Works, which, together with a considerable degree of standardisation, brought Stratford to an exceptionally high position among British locomotive works in the speed and efficiency of its locomotive production. Some of the extensively-built locomotive classes that came into existence under his aegis may not have been outstanding in performance on the road, or in fuel economy, but they were rugged in design and with their massive working parts have paid handsome dividends in reliability and ease of maintenance. So much so, indeed, that at the time of writing, 47 years after Holden's retirement, many of his engines are still in active service."

For the first thirteen years of his tenure at the GER, Holden displayed no interest in locomotive bogies. His predecessors had vacillated between 0-4-4 and 2-4-2 tanks for suburban and branch services, and between both 2-2-2 and 4-2-2, and 2-4-0 and 4-4-0 tender types for express passenger service, but Holden came down firmly on the side of single axles with side-play rather than a leading or trailing bogie. Indeed, whereas at his accession to power the GER owned some 75 bogie single or four-coupled engines, by the end of 1897 their number had dwindled to twelve. Then, just as the bogie appeared to be doomed to extinction on the Great Eastern, he changed his mind, and in no more than three years had brought out new 4-2-2 and 4-4-0 passenger and 0-4-4 tank classes.

As to externals, Holden continued for thirteen years to fit his engines with stovepipe chimneys, and also with Thomas Worsdell's capacious cab, with its gracefully curved side-sheets. But while for a time he continued also the Worsdell three-ring boiler barrel, with 106 the dome on the middle ring, before very long he designed a two-ring boiler with the dome on the front ring, immediately behind the chimney, a practice which, with the stovepipe chimney, helped to give most of his engines a very distinctive appearance. Internally, he substituted Stephenson link-motion for the Joy motion preferred by Worsdell.

On his arrival at Stratford, Holden lost no time in getting to work. In his first year, four separate locomotive classes were put in hand 2-4-2 tanks, 0-6-0 tanks, 0-6-0 freight engines, and the first of a new 2-4-0 express passenger type. This was No. 710, prototype of the well-known T19 class, which was to prove the mainstay of Great Eastern main line passenger service for many years. While the new engine closely resembled one of the Worsdell Gl4s, the boiler was slightly larger, with 1,230 as against 1,200 sq. ft. heating surface, and 18.0 as compared with 17.3 sq. ft. grate area; cylinders were 18 in. by 24 in., and weight in working order 42 tons. Building of these engines continued for eleven years, from 1886 to 1897, until there were 110 of them in all. The first sixty, numbered from 710 to 779 inclusive, had the older three-ring boiler with the dome on the middle ring and a pressure of 140 lb.; then in 1892 there followed Nos. 700 to 709 and 781 to 790, in 1893 Nos. 1010 to 1019, in 1895 Nos. 1020 to 1029, and in 1897 Nos. 1030 to 1039, with the two-ring boiler and the dome well forward. Not until the last ten did the boiler pressure rise to 160 lb., but in course of time all the engines of the class were fitted with 160 lb. two-ring boilers. When rebuilt in 1900, No. 758 acquired an extended smokebox of curious appearance, for it was of smaller diameter than the boiler barrel, and with a flange round the outer edge of the extension it looked exactly like the inner tube of a telescope party drawn out.

Holden developed oil-burning initially in stationary boilers at Stratford Works, but subsequently on suburban locomotives and finally on express locomotives.[3],[3]. When Holden introduced his oil-burning equipment, Nos. 712 and 759 to 767 inclusive were fitted with it, and their tenders acquired on top two cylindrical tanks, arranged longitudinally, to accommodate the oil fuel; No. 760 received the name Petrolea in honour of this change. Nos. 762 to 767 and 1030 to 1039 also had their tenders fitted with water-scoops in preparation for the non-stop running over the 130 miles between Liverpool Street and North Walsham of the summer Cromer Express (later the Norfolk Coast Express), which began on July 1, 1897, water-troughs having been laid down both at Halifax Junction, Ipswich, and at Tivetshall St. Mary for this purpose. The engine chosen for the inaugural run was No. 1037.

Other distinguished services rendered by T19 class 2-4-0s included the working of the funeral train of the late Duke of Clarence from King's Lynn to Windsor by No. 755 on January 28, 1892, and of the honeymoon train of the then Duke and Duchess of York. James Holden was a Quaker and this led to a rather paternalistic type of management where trade unionism was not encouraged. His most lasting contribution was that of standardization which Greley wisely did not disrupt leaving the Great Estern lines with standard locomotives many of which lasted to the end of steam, almost to the end of much railway activity in East Anglia.

The Decapod developed mainly under the Chief Draughtsman Russell was an extraordinary endeavor to develop a steam locomotive which could perform at the level of electric traction.[4]

[edit] Engines

Some of the "Main Article" links below redirect back to this page, or contain less information than this page. Content needs to be taken from this page and added to the given "Main Article".

Please see Whyte notation for a description of the notation used in the section headings below. The page "Steam locomotive nomenclature" may also help understanding the below.

[edit] 0-6-0

[edit] F48 and G48 (LNER J16 and J17): 1900-

Main Articles: GER Class F48 and GER Class G48

The F48 class were built between 1900 and 1903 and had round-top boilers; there were sixty of them. The G48 had Belpaire boilers, like those fitted to the T19 class and the initial 0-6-0 to be fitted was a F48 No. 1189. A further thirty of the Belpaire boiler type followed to form class G48. The G48 class was superheated between 1915 and 1932. From 1921, all the round-top boilers were replaced by the Belpaire type and the majority were of the superheated type. The J16 category ceased to exist in 1932. At first Macallan blastpipes were fitted, but later the Stone's variable blastpipe was substituted. Plain blastpipes were substituted between 1924 and 1929.[5]

[edit] 4-4-0

[edit] D13 (LNER): 1905-

Main article: LNER Class D13

They were rebuilt from sixty T19 class 2-4-0s with boiler similar to that used on Humpty Dumpties. The bogies came from Massey Bromley 0-4-4Ts and Worsdell 4-4-0s. Most had been fitted with superheaters by 1926. The last survivor (8039) was withdrawn in 1944.[6]

[edit] S46 Claud Hamilton dynasty: 1900-

(Allen 1961) noted that "of all the locomotive designs that emerged from Stratford Works during the reign of James Holden, the one destined to achieve the greatest fame, beyond question, was his Claud Hamilton" type 4-4-0, of which the pioneer example, No. 1900 Claud Hamilton, took the rails in 1900"; he devotes a whole chapter to it. It is widely considered one of the classic locomotive designs, and three later Great Eastern Railway classes and three LNER classes were descended from it.[7] F.V. Russell (Holden's Chief Designer) is generally accepted as the Claud Hamilton's actual designer. (Ellis 1965:61) notes: "Mr Holden, by then a valetudinarian was making a long recuperative stay in Egypt"; this was related to Ellis by Russell.

The Claud Hamilton's boiler had 1630 sq. ft. of heating surface, with 21.3 sq. ft. grate. Its cylinders were 19 x 26 in. with flat valves placed below, operated by Stephenson's motion. The coupled wheels were 7 ft. in diameter.

(Allen 1961) reports Claud Hamiltons in their original state were capable of taking around 350 tons from Liverpool Street to North Walsham in under the booked time. No. 1882 with round-top boiler ran the 130.2 miles in 156 min. 60 secs. Even heavier trains were managed in the up direction: No. 1809 (Belpaire boiler) took 400 tons up in 157 min. 24 seconds.

The Royal blue of the Great Eastern livery, with its scarlet lining out, was embellished with a copper chimney cap, and brass beadings round the rim of the safety valve casing, the front and side cab windows, the top and bottom of both cylinders of the Westinghouse brake compressor, the coupled wheel splashers, and the four openings that had been cut in subsidiary coupling rod splashers—in London & North Western style—to give access to the coupling rod pins when the rods were up. In contrast with the blue livery was the vermilion with which the buffer beam and coupling rods were painted. Another feature of great distinction, begun by James Holden with the "Claud Hamilton" 4-4-0s, was the broad steel ring, polished bright, that encircled the smokebox door, and made it possible to dispense with the usual straps across the door. Before very long, the painted representation of the G.E.R. coat-of-arms on the driving splashers was replaced by a replica cast in relief and picked out in colour.[8]

[edit] 2-4-0

[edit] T19 (710 class): 1886-97
Main article: GER Class T19

The T19s was similar to the Worsdell G14, but had a slightly larger boiler. 110 locomotives were constructed. They had 18 x 24in cylinders and the last ten had 160psi boilers, but the remainder were gradually fitted with two-ring boilers. No. 758 was fitted with an extended smokebox in 1900. Oil burning apparatus was fitted to No. 712 and 759-767. No. 760 was named Petrolea. Tenders with water scoops were fitted to Nos 762-7 and 1030-9 to enable the Cromer expresses to run non-stop from Liverpool Street to North Walsham from 1 July 1897. Water troughs were installed at Halifax Junction, Ipswich and at Tivetshall St. Mary. No. 755 hauled the funeral train for the Duke of Clarence from King's Lynn to Windsor on 28 January 1892. No. 761 hauled the honeymoon train for the Duke and Duchess of York from Liverpool Street to King's Lynn on 6 July 1893. In spite of all this Royal patronage 29 were scrapped between 1908 and 1913. Although none of the 2-4-0s survived into LNER ownership, some in their rebuilt as 4-4-0 form did and this provided the authors of (RCTS 1981) with an excuse to disentangle the complex variations within the 110 locomotives as built. See also (Ahrons 1951).

[edit] Humpty Dumpties: 1902-

A Humpty Dumpty
A Humpty Dumpty
Main article: GER Class T19 Rebuilt

No 769 and twenty others were fitted with 4ft 9in diameter Belpaire boilers. This increased the grate area from 18 to 21.6 ft2; the total heating surface from 1230 to 1476 sq. ft. and the boiler pressure was raised to 180psi. The ungainly appearance led to the nickname, but no official name has yet been found. All had been withdrawn by 1920. From 1905 sixty were rebuilt as 4-4-0s.

[edit] T26 (LNER E4): 1891-1902

Main article: GER Class T26

Derived from T19 class but with much smaller (5ft 8in) driving wheels and intended for mixed traffic work. One survived to form a part of the National Collection and there are happy Transacord recordings of their gentle chuffing through the byways of East Anglia.

[edit] 4-2-2

[edit] P43: Holden 1898

Main article: GER Class P43

Constructed with oil-burning apparatus to speed the elite from the City of London to Cromer, West Runton & Sheringham[9] and capable of reaching North Walsham non-stop in just over two and a half hours.[10] They had 18 x 24 in. outside cylinders and 7ft. 6in. driving wheels.[11]

[edit] 2-2-2

In 1888 Holden experimented by removing the side rod of T19 No. 721 to form a 2-2-2.[12] In 1889 the first of new class appeared: initially No. 740 (later 789 and 780) and this was followed by two batches of ten: 770-779 in 1891 and 1000-1009 in 1893. One of their main spheres was on the Joint Line working expresses to York. In 1896 the class inaugurated the epic making non-stop run to North Walsham using oil-firing. No. 780, had inside cylinders (18 x 24 in.).[13] (Rous-Marten 1898a) found that the singles climbed Brentwood Bank more rapidly than the 2-4-0s. See also (Ahrons 1951).

[edit] 0-10-0T

Main article: GER Decapod
James Holden stands in front of the Decapod.
James Holden stands in front of the Decapod.

This is the famous Decapod. It was built under Holden in 1902 to forestall an imminent scheme for an electrified railway out of London to suburbs served by the Great Eastern. Since the proponents of the scheme had a slogan about electric trains accelerating to thirty miles an hour in thirty seconds, Holden resolved to obtain the same performance with steam traction. Most of the design was accomplished by his chief designer (Frederick Vernon Russell). A massive boiler with Wootten firebox, three cylinders each with its own blastpipe cone, and ten smallish driving wheels ensured a lively acceleration. On trial it did rather better than 30 mile/h in thirty seconds, accelerating at 1-46 sec/sec: This performance put an end to the electrification scheme even though (as Holden had known all the time) the regular use of so massive a machine would never have been permitted by the civil engineer.[14], [15]

[edit] 0-6-0T

It should be noted that the compilers of (RCTS 1983) dispute earlier information, including some of that published by (Proud 1945), (Ahrons 1951) and (Allen 1961). Nevertheless, the magic of these small locomotives is best captured by (Allen 1961)'s personal memories:

"[In 1889 one of Holden's shunting tanks engines was fitted with the Westinghouse brake and evaluated on passenger working.] So the 1889 experiment resulted in eighty of these handy tanks, slightly larger than Class T18 and classified as Great Eastern Railway. Class R24 being turned out from 1890 to 1896 inclusive, and taking over the whole of the suburban working between Liverpool Street and Chingford, Enfield Town, and Palace Gates; twenty shunters of the same type emerged in 1890 and 1891; and, in addition, in 1889 and 1893 Holden built twenty smaller 0-6-0 tanks (Class E22) with 14 in. by 20 in. cylinders and a weight of 36½ tons, for light branch work. Some of the latter worked for years between Fenchurch Street and Blackwall with part of their side rods removed, so converting them to the 2-4-0 wheel arrangement.
The feats of the diminutive R24 0-6-0s with their packed trains of 15 four-wheelers verged on the incredible. Between 1900 and 1912 my [Allen]'s parents lived in a house in Upper Clapton which overlooked the whole sweep of the Hackney Marshes from Lea Bridge to Tottenham, with the stretch of the Chingford branch from Clapton Junction to St. James Street, Walthamstow, in view across the River Lea almost immediately opposite. Some of the up morning workmen's trains were non-stop from Hoe Street, and had the advantage of a start down at 1 in 125 and 1 in 80 to Hall Farm Junction; and I am prepared to take an affidavit that their speed across the marshes, with the coupling-rods of their 4 ft. wheels loudly ringing as they lashed round at terrific speed, was nearer sixty miles an hour than fifty.
When the intensive suburban service of 1920 was introduced, reliance was still placed largely on these cheerful little 0-6-0s to maintain the new split-second timings, and they were quite equal to the task. By then their numbers had been further reinforced by the twenty built in 1900 and 1901 with 160 lb. boilers, and by a further twenty turned out in 1904, the latter with 180 lb. pressure, larger boilers giving 988 sq. ft. heating surface and 14.5 sq. ft. grate area, and side-tanks holding 1,200 gallons, which increased the weight to 42½ tons. Those built from 1912 onwards were decorated with flared-top chimneys, in place of stovepipes, and the high-roofed cab with side-windows which was now the Holden standard."

To reiterate, this quotation should not be considered definitive. Instead see (RCTS 1983).

[edit] T18 (LNER J66): 1886-88

Main article: GER Class T18

These small locomotives had 16¾ x 22 in. cylinders, 4ft. coupled wheels and a grate area of 12.4 sq. ft.. They were rebuilt between 1898 and 1908. One was sold to the Mersey Electric Railway.[16]

[edit] E22 (J65): 1889-93

Main article: GER Class E22

These had either 4ft. 0in. or 4ft. 2in. coupled wheels (sources are contradictory, see [17] and [18]), 14 x 20 in. cylinders and were lighter than the T18 class. They were reboilered between 1889 and 1912. The Macallan variable blastpipe was removed from 1924. They ran as 2-4-0Ts on the Fenchurch Street to Blackwall service and were sometimes known as "Blackwall tanks". They operated on the Stoke Ferry, Eye and Mid-Suffolk branches. They became extinct in 1956.[19]

[edit] Patents

[edit] 28,946/1902

Improvements in locomotive engines.

With Frederick Vernon Russell.

Adding forked opening to connecting rods.

Applied 31 December 1902. Accepted 3 December 1904.

[edit] 708/1903

Improvements in or relating to apparatus for distributing sand beneath the driving wheels of locomotive engines and other motor vehicles on railways and tramways.

Added links between driving wheels to prevent wheel slip (used on "The Decapod").

Applied 10 January 1903. Accepted 26 November 1903.

[edit] 21837/1910

Improvements in and relating to liquid fuel apparatus for the furnaces of locomotive and other boilers.

With Frederic Jocelyn Davis and John Charles Taite.

Applied 20 September 1910. Accepted 15 June 1911.

[edit] 6642/1904

Improvements in and relating to spark-arresting apparatus.

With Edmund Spenser Tiddeman

Applied 18 March 1904. Accepted 19 January 1905.

[edit] Notes

  1. ^ (Marshall 2003)
  2. ^ (Marshall 2003)
  3. ^ (Rutherford 1995)
  4. ^ (Skeat 1953)
  5. ^ (RCTS 1966)
  6. ^ (RCTS 1981)
  7. ^ (RCTS 1981)
  8. ^ (Ellis 61)
  9. ^ (Rous-Marten 1902:272)
  10. ^ Rous-Marten 1898b
  11. ^ (Fryer 1993)
  12. ^ (Allen 1961:114)
  13. ^ (Rous-Marten 1902:272)
  14. ^ (Skeat 1953)
  15. ^ (Skeat 1954)
  16. ^ (RCTS 1983:73-77)
  17. ^ http://www.steamindex.com/locotype/gerloco.htm
  18. ^ http://www.lner.info/locos/J/j65.shtml
  19. ^ (RCTS 1983:70-73)

[edit] References

  • Allen, C.J. (1955). The Great Eastern Railway. London: Ian Allan. 
  • Allen, C.J. (1960). Great Eastern. London: Ian Allan. 
  • Allen, C.J. (1961). The Great Eastern Railway, 3rd edition. London: Ian Allan. 
  • Ahrons, E.L. (1951). in Asher, L.L. (ed.): Locomotive and train working in the latter part of the nineteenth century. (Volume 1). Cambridge: Heffer. 
  • Ellis, C.H. (1942). "Famous locomotive engineers: No. 20 James Holden". Locomotive Carriage and Wagon Review 47: 110-115. 
  • Ellis, C.H. (1949). Some classic locomotives. London: George Allen & Unwin. 
  • Ellis, C.H. (1965). The splendour of steam. London: George Allen & Unwin. 
  • Fryer, C. (1993). Single wheeler locomotives. Oxford Publishing Co.. 
  • Marshall, J. (2003 (Originally: 1978)). Biographical dictionary of railway engineers. 2nd ed.. London: Railway & Canal Historical Society (Originally: Newton Abbot: David & Charles ). 
  • Proud, P. (1945). The Great Eastern Railway 0-6-0Ts. Railway Correspondence & Travel Society. 
  • RCTS (1966). Locomotives of the LNER. Part 5. Tender engines—classes J1 to J37. Railway Correspondence & Travel Society. 
  • RCTS (1981). Locomotives of the LNER. Part 3C. Tender engines—classes D13 to D24. Railway Correspondence & Travel Society. 
  • RCTS (1983). Locomotives of the LNER. Part 8A. Tank engines—classes J50 to J70. Railway Correspondence & Travel Society. 
  • Rous-Marten, C. (1898a). British express engines. Int. Rly Congress. 
  • Rous-Marten, C. (1898b). "". Engineer. 
  • Rous-Marten, C. (1902). "". Railway Magazine 11: 272. 
  • Rutherford, M. (1995). "Fuel, energy and traction (Provocations Number 1)". Backtrack 9 (1): 33-38. 
  • Skeat, W.O. (1953). "The Decapod locomotive of the Great Eastern Railway". Transactions of the Newcomen Society 28: 169-185. 
  • Skeat, W.O. (1954). "The Decapod locomotive of the Great Eastern Railway: supplementary notes". Transactions of the Newcomen Society 29: 263-264. 

[edit] External links


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aa - ab - af - ak - als - am - an - ang - ar - arc - as - ast - av - ay - az - ba - bar - bat_smg - bcl - be - be_x_old - bg - bh - bi - bm - bn - bo - bpy - br - bs - bug - bxr - ca - cbk_zam - cdo - ce - ceb - ch - cho - chr - chy - co - cr - crh - cs - csb - cu - cv - cy - da - de - diq - dsb - dv - dz - ee - el - eml - en - eo - es - et - eu - ext - fa - ff - fi - fiu_vro - fj - fo - fr - frp - fur - fy - ga - gan - gd - gl - glk - gn - got - gu - gv - ha - hak - haw - he - hi - hif - ho - hr - hsb - ht - hu - hy - hz - ia - id - ie - ig - ii - ik - ilo - io - is - it - iu - ja - jbo - jv - ka - kaa - kab - kg - ki - kj - kk - kl - km - kn - ko - kr - ks - ksh - ku - kv - kw - ky - la - lad - lb - lbe - lg - li - lij - lmo - ln - lo - lt - lv - map_bms - mdf - mg - mh - mi - mk - ml - mn - mo - mr - mt - mus - my - myv - mzn - na - nah - nap - nds - nds_nl - ne - new - ng - nl - nn - no - nov - nrm - nv - ny - oc - om - or - os - pa - pag - pam - pap - pdc - pi - pih - pl - pms - ps - pt - qu - quality - rm - rmy - rn - ro - roa_rup - roa_tara - ru - rw - sa - sah - sc - scn - sco - sd - se - sg - sh - si - simple - sk - sl - sm - sn - so - sr - srn - ss - st - stq - su - sv - sw - szl - ta - te - tet - tg - th - ti - tk - tl - tlh - tn - to - tpi - tr - ts - tt - tum - tw - ty - udm - ug - uk - ur - uz - ve - vec - vi - vls - vo - wa - war - wo - wuu - xal - xh - yi - yo - za - zea - zh - zh_classical - zh_min_nan - zh_yue - zu -

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aa - ab - af - ak - als - am - an - ang - ar - arc - as - ast - av - ay - az - ba - bar - bat_smg - bcl - be - be_x_old - bg - bh - bi - bm - bn - bo - bpy - br - bs - bug - bxr - ca - cbk_zam - cdo - ce - ceb - ch - cho - chr - chy - co - cr - crh - cs - csb - cu - cv - cy - da - de - diq - dsb - dv - dz - ee - el - eml - eo - es - et - eu - ext - fa - ff - fi - fiu_vro - fj - fo - fr - frp - fur - fy - ga - gan - gd - gl - glk - gn - got - gu - gv - ha - hak - haw - he - hi - hif - ho - hr - hsb - ht - hu - hy - hz - ia - id - ie - ig - ii - ik - ilo - io - is - it - iu - ja - jbo - jv - ka - kaa - kab - kg - ki - kj - kk - kl - km - kn - ko - kr - ks - ksh - ku - kv - kw - ky - la - lad - lb - lbe - lg - li - lij - lmo - ln - lo - lt - lv - map_bms - mdf - mg - mh - mi - mk - ml - mn - mo - mr - mt - mus - my - myv - mzn - na - nah - nap - nds - nds_nl - ne - new - ng - nl - nn - no - nov - nrm - nv - ny - oc - om - or - os - pa - pag - pam - pap - pdc - pi - pih - pl - pms - ps - pt - qu - quality - rm - rmy - rn - ro - roa_rup - roa_tara - ru - rw - sa - sah - sc - scn - sco - sd - se - sg - sh - si - simple - sk - sl - sm - sn - so - sr - srn - ss - st - stq - su - sv - sw - szl - ta - te - tet - tg - th - ti - tk - tl - tlh - tn - to - tpi - tr - ts - tt - tum - tw - ty - udm - ug - uk - ur - uz - ve - vec - vi - vls - vo - wa - war - wo - wuu - xal - xh - yi - yo - za - zea - zh - zh_classical - zh_min_nan - zh_yue - zu