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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<br>
A: Gangwayed corridor<br>
3: Composite (ie more than one) class<br>
1: BR Mark 1 carriage
==See also==
