British Rail Class 124
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The Class 124 was a class of initially six car Diesel Multiple Units used and built specifically for the trans-pennine route. They were progressively shortened during their lifetime, finally finishing as three-car sets. They were all withdrwawn by the late eighties. There was a movement to preserve a set of this class however it was unsuccessful and eventually all were lost.
The class was a sizable maintenance headache for British Rail for two reasons - firstly they were a totally unique class and secondly they featured wrap-round cab front windows which were expensive to build and replace.