A Brake Standard Open (BSO) is a type of railway carriage used by British Rail. Both Mark 1 and Mark 2 types were built. Each consists of a standard class open passenger saloon with a centre aisle, a guard's compartment with hand brake and a lockable luggage compartment.

A number of Mark 1 and Mark 2 BSOs were converted to Brake Standard Open (Micro-Buffet) (BSOT), and fourteen Mark 2 BSOs were converted to Driving Brake Standard Open (DBSO). A number of BSO and BSOT coaches have been preserved, and some are still in use on main line charters. One significant survivor is No. 9267, the last surviving coach in the final excursion train on the Somerset & Dorset line on 6 March 1966, which is appropriately located at Midsomer Norton.

Orders

Lot No.DiagramMarkBuiltBuilderQtyFleet numbersNotes
3017018311955–1956Doncaster779200–9276BR1 bogies
3024418311956Doncaster459277–9321BR1 bogies
3044318311959Gloucester419322–9362BR1 bogies
3069818411963Wolverton189363–9380Commonwealth bogies, fluorescent lighting
3075718521966Derby369381–9416B4 bogies
307771802A1967Derby99417–9425B4 bogies
307881802A1968Derby139426–9438B4 bogies
307981862C1970Derby109439–9448B4 bogies
308201862C1970Derby309449–9478B4 bogies
308241872D1971Derby179479–9495B4 bogies
303831882E1972Derby149496–9509B4 bogies
308611892F1974Derby309510–9539B4 bogies

See also