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LIGHTING
This is a 24 volt system and the saloon lighting units are spaced to give good illumination over the whole area of the car, particularly at the doorways. Marker lights and headlamps are fitted accordingly to requirements.

UNDERFRAME
This is designed as a lightweight steel unit consisting of mild steel channel section electrically welded together. the whole being stiffened with diagonal members and generously gussetted.

WHEELS AND AXLE BOXES
The lightweight rolled steel disc wheels are mounted on two axles carried in self-aligning roller bearings in cast steel axle boxes.

UNDERFRAME SPRINGING
Springing between the axle box and the underframe is by means of rubber shear-compression units specially designed for this purpose. These units consist of rubber, moulded and bonded to steel plates of chevron shape. Each axle box carries two units the former being specially designed to accommodate same. The two units are mounted at an angle relative to each other; this angle determining the ratio of shear to compression. Stiffness in the horizontal direction is very high due to the rubber being mainly in compression in this direction. Lateral stiffness is given by the chevron formation of the units.

BRAKES
Brakes of normal clasp type are employed operated by a straight air system incorporating an emergency feature.

POWER UNIT & TRANSMISSION
This equipment comprises a British United Traction 150 h.p. 6-cylinder horizontal diesel engine capable of providing a maximum speed of 50-55 m.p.h., driving through a fluid fly-wheel, thence through a free wheel unit to a 4 speed epicyclic gearbox. A universal joint shaft takes the drive to the final drive unit mounted centrally on one of the axles. The torque reaction being taken by an arm attached to the underframe and incorporating rubber buffers to absorb shock loads. The final drive unit also incorporates the forward and reversing gears. Engine throttle, gearbox and forward-reverse gear are all operated through electro-pneumatic valves, the air supply being drawn from the system after the brake reservoirs have reached a pre-determined pressure. Combustion air for the engine is taken through a large air filter and thence to the manifold by flexible pipe.

The engine cooling water is taken through a large radiator mounted at the side of the underframe. The fan is driven by a universal joint from the engine and is enclosed in a cowl attached to the radiator body. A header tank incorporating a filler is mounted above the engine to ensure that no steam locks form in the cooling system. This tank also incorporates a low water level switch.

FUEL TANK
This is suspended on one end of the underframe and the filler is located to be easily accessible from rail level. The capacity of the tank is 50 gallons and the fuel is fed through a filter after leaving the tank.

COMPRESSION
The compressor of 15 cu.ft. minute capacity is driven through vee belts from the input end of the gearbox. Air is drawn through a filter and anti-freezer and connections to and from the compressor are flexible to allow for belt adjustment and vibration.

GENERATOR AND CONTROL PANEL
This is of J. Stone manufacture and the generator is also driven from the input end of the gearbox. It should be noted that in this position it is unaffected when the car is coasting my means of the free wheel.

Press Release:
"New
Lightweight
Railbus"
13th February 1958

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