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Carriage type FO (First Open) designates a carriage with open seating, normally around tables, for first class passenger use.
Following the introduction of TOPS in the late 1960s, BR carriages of this class were allocated the [[TOPS code]] '''AD11''', denoting:
A: Passenger carrying stock<br>
D: Gangwayed open (2+1 seating)<br>
1: First class<br>
1: BR Mark 1 carriage
==See also==