2120
typifies the Y6 class locomotive of the Norfolk and Western Railway.
These engines incorporated some radical changes from the earlier
Y3, Y4, and Y5 engines. They were built using cast steel beds
or frames, and were equipped with roller bearings. Road numbers
2120 through 2154 were built between 1936 and 1954 at the home
workshops of the railway in Roanoke. The later Y6a was little
different, numbers 2155 to 2170 being turned out during the Second
World War in 1942. The Y6b of 1948-52 however, utlized a smokebox
mounted feedwater heater, instead of the Worthington side mounted
type of the earlier Y classes.