title: 2-8-4
context: The first American 2-8-4s were built for the Boston and Albany Railroad in 1925 by Lima Locomotive Works. The railroad's route across the Berkshire mountains was a substantial test for the new locomotives and, as a result, the name Berkshire was adopted for the locomotive type.
question: What was the first 2-8-4 steam locomotive?
answers: Berkshire