This locomotive, 1301, is of the Z12/13 class of 4-4-2T engines. However, they started life as 4-4-0 tender engines for passanger duties in 1877. As years passed, these locos were replaced by newer and stronger engines and these got redeployed. In turn, 20 engines were converted to tank engines

https://www.reddit.com/r/trains/comments/jkjhvm/this_locomotive_1301_is_of_the_z1213_class_of/