On Facebook last night I ran across a discussion of roundhouses and where any remnants may still be standing. Someone mentioned the B&O Museums roundhouse and several chimed in that it really wasn't a roundhouse. They gave no definition as to why it didn't qualify but I'm guessing their reasoning was that it was completely enclosed and the turntable was not outside. I've always considered it a roundhouse regardless of the architectural design, albeit an unusual one, but still a roundhouse.
What say ye?
Jerry