Yep , It was the train's crew job to protect MOW movements whatever they were. unloading ballast, Burro cranes , Bridge and Building. just about anything.
The conductor and tail end crew actually lived in the caboose for weeks at a time on some MOW jobs. ( not like the one in the pic above it's not a caboose) Engineman also had their own bunk cars complete with stove , coal oil fridge, Bed on some of the remote area jobs.
Here what a Ballast unloading train might look like.... 2 GP-9s Engine bunk car, Spreader, operator's bunk car and tool car, Jordan spreader,,, 15 air dumps (Lionel 3559s) and the conductors caboose. Conductors probably had their own caboose back in the 40s and 50s. If the conductor was sick the senior brakeman would become the conductor unless there was a conductors spare board.
Usually the bunk cars and tool cars would be left on a siding while unloading. sometimes the caboose a well.