This is Guilford's train BFPO - Bellows Falls VT to Portland Maine. It is a solid train of clay slurry, used in paper production. Here we see it...
One of the last ex-Santa Fe SD26s left on Guilford... still on the move in 2007! Photo taken at Ayer MA.
My HO scale Atlas SD26 in its Guilford colours rumbles through my OO scale UK layout. Must've been a major switching error somewhere!