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Met-Camm 6/8-car Blue Pullman

Auxiliary Power

Auxiliary Control

Current for lighting, air-conditioning, refrigeration, battery-charging and ancillary equipment was supplied by two underfloor mounted generating sets, each set comprising an 8-cylinder Rolls Royce horizontal engine direct coupled to a Stones Tonum alternator. The output of one set was sufficient for normal winter and summer requirements, the second set was carried for use as a standby and for use under extreme conditions. The engine was rated at 190hp at 1,500 rpm and the three-phase 50-cycle alternator at 133 kVA, 400v.

Right: The auxiliary engine control panel. Clockwise from lower left the lights indicated fuel on, low oil pressure, low water level, idling and starting. The two smaller centre buttons were for start and stop.

shore supply

In the 6-car train the generating sets were mounted underneath each of the kitchen cars and in the 8-car sets they were underneath the second class parlour cars.

Provision was also made for the operation of the lighting, refrigeration and air-conditioning equipment from an external three-phase a.c. supply when the train was stationary. Static power supply points were provided at terminal stations on the routes served by these trains. The junction box for the 120kW shore supply is shown on the left.

The 400v a.c. three-phase 50 cycle power for lighting and air conditioning was distributed by two four-wire feeders running the length of the train. Connections between the cars were made through Stones Kleops intercar couplings, and the circuits so arranged that if a coupling was broken the feeder was immediately disconnected from the power supply. The bulk of the lighting was supplied at 230v a.c. by phase-to-neutral connection of the 400v feeders, and the remainder was supplied at 110v a.c. from a 230/110v lighting transformer. The compressor, condenser-fan motor, and the floor and air heaters were connected to the three-phase 400v supply.

The air-conditioning fan motor and the control circuits were supplied at 24v d.c. from a three-phase transformer/rectifier unit. This supply was also used to charge a 24v 216 Ahr battery for auxiliary engine starting and emergency lighting.

Right: The instrument and indicator lights panel.

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