Hi Andrew,
While I can't say where those photos were taken, they are not of Edaville Railroad in So. Carver Mass, where the B&SR equipment resided following the railroad's closure in the early 1940s. Moreover, the equipment doesn't match anything from the Maine two footers. I also suspect the track gauge is 36" and not 24".
So unfortunately, the photos are not of the B&SR Railroad in Maine (or Edaville in 1960.)
Thanks for sharing, hopefully someone will positively identify the location.
-Ed