DBSO Push-Pull

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The DBSO (Driving Brake Standard Open) coaches were converted at Glasgow Works from 1974-built Mk2f BSO coaches.

DBSO 9707 heads an Aberdeen - Glasgow train at Arbroath in the 1980's. Photo by nixer10

The rebuild involved fitting the brake-van end with a half-cab and an EMU style power controller linked to a TDM transmitter.

The TDM (Time Division Multiplex) system sent pulsed control signals through the carriage lighting control circuits.

This system meant any air-braked coach could be include in the formation.

Worked with TDM translator fitted Push-Pull Class 47/7 locomotives.

Initially used on the Edinburgh Waverley - Glasgow Queen Street (E&G) route.

Trials started in August 1979 and the first DBSO push-pull set in passenger service ran on 22nd October 1979, powered by locomotive 47709. Further sets were introduced to replace the class 27 push-pulls by February 1980.

9701-9710 converted in 1979.
9706 cut up after Polmont crash in 1984.
9711-9713 converted in 1985
9714 converted in 1986

Obstacle Deflectors fitted in 1985 in response to Polmont crash.

Repainted in ScotRail Express livery between Autumn 1984/Spring 1985.

Extra DBSOs were converted for use on the Glasgow - Aberdeen route from May 1985.

Whether on Edinburgh or Aberdeen duties, the usual formation had the DBSO at the Glasgow end of the train.

Push-pull sets were used on Summer Sunday Oban line excursions in the 1980s

The DBSOs were transferred away from Scotland in May 1990, for use on the London Liverpool Street - Norwich route. At this time they overhauled at Derby works, the cab end gangways were removed, and updated TDM equipment compatible with electric locomotives was fitted.