Brake Standard Open

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British Rail Brake Standard Open
BR Mk1 BSO.jpg
In service 1955–
Manufacturer Mark 1: BR Doncaster, Wolverton and Gloucester RCW
Mark 2: BR Derby
Family name British Railways Mark 1,
British Rail Mark 2
Constructed Mark 1: 1955–1963
Mark 1: 1966–1974
Number built 340
Fleet numbers 9200–9539
Capacity Mark 1: 39
Mark 2/A–D: 31
Mark 2E/F: 32
Operator British Rail
Specifications
Car length 66 ft 0 in (20.12 m)
Width 9 ft 3 in (2.82 m)
Height 12 ft 9 12 in (3.90 m)
Maximum speed 90–100 mph (145–161 km/h)
Weight 33 long tons (34 t; 37 short tons)
Train heating Steam, Electric or both
Bogies BR1, Commonwealth, or B4
Braking system(s) Vacuum, Air, or both
Coupling system Drop-head knuckle coupler on draw-hook
Track gauge 4 ft 8 12 in (1,435 mm) standard gauge

A Brake Standard Open or 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.

Orders[edit]

Lot No. Diagram Mark Built Builder Qty Fleet numbers Notes
30170 183 1 1955–1956 Doncaster 77 9200–9276 BR1 bogies
30244 183 1 1956 Doncaster 45 9277–9321 BR1 bogies
30443 183 1 1959 Gloucester 41 9322–9362 BR1 bogies
30698 184 1 1963 Wolverton 18 9363–9380 Commonwealth bogies, fluorescent lighting
30757 185 2 1966 Derby 36 9381–9416 B4 bogies
30777 180 2A 1967 Derby 9 9417–9425 B4 bogies
30788 180 2A Derby 13 9426–9438 B4 bogies
30798 186 2C 1970 Derby 10 9439–9448 B4 bogies
30820 186 2C 1970 Derby 30 9449–9478 B4 bogies
30824 187 2D 1971 Derby 17 9479–9495 B4 bogies
30383 188 2E 1972 Derby 14 9496–9509 B4 bogies
30861 189 2F 1974 Derby 30 9510–9539 B4 bogies


See also[edit]