Changes

'''Carriage type BSK (Brake Second Corridor) ''' designates a carriage with a Guards's compartment, together with second (later standard) class passenger compartments accessed from a corridor. Following the introduction of TOPS in the late 1960s, BR carriages of this class were allocated the [[TOPS code]] '''AB21''', denoting: A: Passenger carrying stock<br>B: Gangwayed corridor brake<br>2: Second (later standard) class<br>1: BR Mark 1 carriage