The Taff Vale Railway A class was a class of 0-6-2T steam tank locomotives designed by J. Cameron for mixed traffic work and introduced to the Taff Vale Railway (TVR) in 1914.

[2] The first 51 locomotives initially had boilers working at a pressure of 160 pounds per square inch (1,100 kPa), which (except for no.

All of the A class locomotives were rebuilt with taper boilers and superheaters by the GWR between 1924 and 1932; these also worked at 175 psi (1,210 kPa) at first.

Their initial GWR numbers were in the ranges 335–408 (for locos working at a boiler pressure of 175 psi (1,210 kPa)) and 438–441 (pressure 160 psi (1,100 kPa)), but they were not consecutive and were intermingled with other classes.

[8] The order for these six locomotives was transferred to North British and they were delivered as nos.