Category:Carriage Type CK
Carriage type CK (Composite Corridor) designates a carriage with passenger compartments of more than one class (normally first and third) accessed from a corridor.
Following the introduction of TOPS in the late 1960s, BR carriages of this class were allocated the TOPS code AA31, denoting:
A: Passenger carrying stock
A: Gangwayed corridor
3: Composite (ie more than one) class
1: BR Mark 1 carriage