Big Pool was reached by the WM in 1892 to connect with the Baltimore and Ohio Railroad (B&O) across the river at Cherry Run, WV. This new connection allowed for increased traffic that made this part of the WM the busiest on the entire railroad. In the spring of 1904 the building of the Cumberland Extension began here at Big Pool. The Western Maryland reached Hancock by December of that year and Cumberland by March 1906. A train-order office was constructed here to control the busy interlocking of the connection with the B&O and the new West Sub/Cumberland Extension traffic. It remained in use for a long time and was manned 24 hours a day. I believe it later closed in 1977 and was torn down. Also, back in the early steam days at Big Pool there was a huge wooden trestle constructed here. It was used to unload coal from hoppers and fill passing steam locomotives. It was later replaced by bigger tenders on the newer steam locomotives.
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Measured the foundation, keep in mind the back wall is missing and the west rear corner. Starting at the east rear corner to the front the concrete wall measures 168 1/2 inches. Across the front the wall is 196 1/2 inches. Now turning back towards the rear the wall is shorter and measures 90 1/2 in. A short square like foundation sticks out now and slopes down slightly west from the rectangle foundation and is 68 inches. Turning the corner to go back again it now measures 54 1/2. From this corned the back wall has been "pulled away" ans is gone. Perhaps this was done to remove the switch control linkage under the building to the tracks.