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Class 100 Gloucester RC&W 2-car DMUs

The main consideration during design was saving weight to obtain good acceleration, and robust construction to give a long working life. The integral type body structure was assembled from welded units, considered the most suitable as this used methods within the scope of existing railway carriage workshop equipment and techniques. Closed or tubular sections were used to take advantage of their superior elastic stability and torsional resistance. This arrangement gave them a distinctive "pinched in" smooth lower bodyside arrangement, with no visible underframe.

Construction - Basic Structural Design

Weight saving is always desirable with rail vehicles; but the British Railways C1 loading gauge, with its constriction at platform level and maximum width a little higher at seat level posed problems when considering a really satisfactory design of integral framing. An integral type of frame structure made up from welded units - sub-assemblies such as body sides, ends, floor roof and so on, was thought to be the solution to these problems, and a box girder made up largely of tubular sections was seen by the designers as having advantages, particularly as during the life of a vehicle most frame members are called upon to act as struts, for which tubular sections have superior stability and resistance to torsion. The result was a body shell with a weight of just 21% of the completed railcar empty weight, and in the case of the driving trailer 26 per cent.

Power Car t. c. q. lb.
Body Shell 6 7 3 0
Engines and other equipment 3 5 0 17
Other equipment and general interior finish 9 4 0 5
Fuel and water - 7 0 16
Bogies : driving 5 11 0 10
trailing 5 9 3 8
Total weight of Railcar 30 5 0 0
Driving Trailer t. c. q. lb.
Body Shell 6 7 3 0
Other equipment and general interior finish 8 8 0 18
Heater fuel and water - 5 1 0
Bogies : with dynamo 4 19 3 0
without dynamo 4 14 0 10
Total weight of control trailer 24 15 0 0

An empty set weighed 55 tons, and fully laden would be approx. 66 tons with a seating capacity of 118, the weight per seat was 1,035lb, and hp per ton of empty weight was 5.45, and 4.6 hp per ton when fully laden.

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