Drawings and diagrams
A general arrangement diagram of the Motor Car
A couple of things to note is the fan is electric, these were mechanically driven on BR Built units and an Achilles heel for them, 1101 has had its one replaces with an ex73 electric fan as the fan clutch mechanism failed not long after preservation.
Also like all other Thumpers the driven bogie is the rear one but in this case its also carrying the second coach as these units were articulated throughout
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General layout drawings of the units the first two are of the 3 car units and the third a 5 car unit