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add TOPS code
BR also produced a limited number of Mk 1 Second Open (SO) carriages with 3 seats across, arranged 2+1 with an offset aisle, intended mainly for use as Third/Second/Standard class restaurant cars. The TSO was thus the 'normal' second class / standard class carriage.
Following the introduction of TOPS in the late 1960s, BR carriages of this class were allocated the [[TOPS code]] '''AC21''', denoting:
A: Passenger carrying stock<br>
D: Gangwayed open (2+2 seating)<br>
1: Second (later standard) class<br>
1: BR Mark 1 carriage
==See also==