The GWR 6100 Class is a class of 2-6-2T side tank steam locomotives. The class was designed by Charles Collett and introduced in 1931 and were a straightforward development of the earlier 5101 class (and for that matter the 1905 3100/5100 class). The main difference from their predecessors was an increased boiler pressure of 225 psi with a consequent increase in tractive effort.

70 were built, one locomotive, 6106, has survived into preservation