Did you mean GV instead of GJ? We had "M" mileposts (Mechanicville) from WY to Schenectady. A virtual M-0 was somewhere around Mechanicville station, I believe, but the physical "M" mile posts began at WY, with M-2/B-147. The M series continued to Schenectady, where there was a short mile between M-17/B-132 and S-0/B-131. From Schenectady the "S" miles ran up to S-14/B-117 at DJ. South of DJ (A-26/B-117) they were Albany mile posts.
To make things even more confusing, the bridges between DJ and WY were numbered by mileage from Albany via DJ, so those numbers didn't correspond with the mile posts, either. Same with the Nineveh Branch, except the bridge numbers showed mileage from SW Cabin. Bridge 3.15 crossed the Susquehanna River at Center Village.
The employes' time table only showed miles from DJ and WY for the Schenectady Main and the Mechanicville Branch, so none of those time table miles corresponded with the actual mile posts. Also, since the B&M owned the "inward" track between QS and WY, they had Boston mile posts on their side of the railroad. The D&H maintained both tracks between QS and Mechanicville West, and the B&M maintained the signals even though they were D&H style equipment.
During my time, up to August 1972, the Susquehanna (2nd) Sub track seniority district extended from WY (exclusive) all the way through Schenectady to Binghamton and Jefferson Jct., and KN (exclusive) through DJ. Saratoga Sub extended from KN (inclusive) to WY (inclusive), the New Connection north of QG, and the Ballston Branch north of GV, to MP 79.20, the former division boundary with the Champlain Division. If they gave the Mechanicville Branch to the Saratoga Division, it was after 1972.
My territory as Track Supervisor at Oneonta corresponded with the Susquehanna Sub seniority district, so all of my people could work anywhere on the subdivision, and nowhere else. Crane and bulldozer operators had system seniority, and track machine operators were a special case.
- Gordon Davids