Dave may be looking at Sandbank yard, which was (is?) just across the river from Schenectady, parallel to the former NYC/PC main line. I'm pretty sure it's been out of use for quite some time. At one time there was a yard lead/siding between CP9 in downtown Schenectady and the Sandbank yard. In the late '70s I worked a traveling switcher out of Selkirk that picked up interchange cars from D&H there every night. The cars were pulled from the D&H connection by a Sandbank yard engine. I think that interchange was moved to the Port of Albany, and CP crews now run them into Selkirk themselves.