Chrisjo's train pix

The diesel engine and all its ancillary equipment is under the floor. The exhaust pipe goes from the underfloor engine to one end of the carriage, then up to roof level above the LH driver's window. There is one powered bogie and one trailer bogie.  The 153 class was made from the 2-car 155 class, by de-coupling the two cars and constructing a new cab at the inner end of each one.  This is a drawing of the 155....

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Thanks Dr Chris for that diagram. So each car would have to be filled up with diesel fuel at the filling station. That Cummins engine looks to be like a motor found in a truck