Standard Open

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British Rail Standard Open
A Mk1 SO at the Midland Railway Centre in 2006
A Mk1 SO at the Midland Railway Centre in 2006

In service 1963-
Manufacturer BR Swindon,BR Derby, Eastleigh, York and Birmingham RCW
Operator British Rail
Specifications
Car length 64 ft 6 in
Width 9 ft 3 in
Height 12 ft 9 1/2 in
Maximum speed 90-100 mph
Weight 34 tons

Second Open or Standard Open (coded SO) is a British coach designation for open-plan second class (later standard class) coaches with 2+1 abreast seating, usually seating 48 passengers. Second class coaches with more conventional 2+2 abreast seating were designated Tourist Standard Open (TSO).