White River Junction had a pit turntable and a very cool roundhouse. Wood with clapboard siding, some double hung windows, and 'cause there wasn't enough space, the roundhouse doors were right at the pit edge. Open a door and one false step and you fell into the pit. I don't have any photo's alas, but the one's I saw could be the basis for some great models.
David Starr www.newsnorthwoods.blogspot.com
Not B&M, but also in a heavy snowfall area (Trains magazine, Feb. 1980 - Beyond the 100" Isoline), the CNR branches in this area often had a turntable located, in many cases, literally at the end of the line. There was usually no engine house or turntable pit. The approach track was often on a fill, with a regular bridge-style turntable sitting ,more-or-less, on the ground. Operation was either by the "armstrong" method or via an air-operated engine running off the loco's brakepipe.
Wayne