Cabooses serve many purposes on a train.
Observing the train itself is one. The bay window caboose is not so unusual, but the Shawmut had two bay window cabooses made out of boxcars. Here we see number 150 in the Brookville yard. Rumor has it they were renumbered at one point and they were lost track of over time. After relettering, it was used on many BV locals and is one of the standard cupola types.