Coupling code: White Circle
Underframe: 64ft 6in
Engines: AEC 150hp
Built in two batches, the first being 79xxx cars for the Edinburgh - Glasgow services, and a second being 5xxxx cars for the Glasgow - Ayrshire / Stranraer lines.
Although both had the white circle coupling code, there were considerable differences in the control system between each type, the first being an adaptation of the yellow diamond system, the second was essentially identical to blue square. The vehicles also differed from most other DMUs having buckeye couplings and Pullman gangways, and were unique in not having through air pipes.
The Edinburgh - Glasgow line became loco hauled in 1971 with almost all of the 79xxx vehicles being withdrawn, although some had been transferred to Ayrshire which became the only 79xxx cars to receive a class number. Some were sold so a mining railway in Liberia.
The last vehicles were withdrawn in 1982, a three-car Ayrshire set and four buffet cars were preserved.