I live along the D&H, between the Saratoga and Ballsotn Spa realignment projects. Just north of my house, at mp A34, the line curves left, under rte. 50. The old line went straight. Just south of the SPAC lot, there is a park entrance to the picnic areas. Just before the toll both, there is a section of ROW, heading south. This is now a nature trail.
In saratoga, the yard was behind the Price Chopper, on Ballston Avenue. The old freight house is on W. Circular. One can see where the line crossed Washington St. The old station was where the down town Price Chopper is. The line crossed Church St. and went next to the Country Corner Cafe. It then was just behind the buildings on Broadway. It then used rte. 50's ROW out of town. Before the new plaza, where Best Buy is now, the ROW was visable. It crossed Perry Rd, and Jones Rd, and reentered the new alignment at mp A43.
I don't know all of the streets that the Adirondack branch ran down, through town. It did cross the present main, just north of CPC38. One of the conductors, that worked out of old Saratoga Yard told me some things about the project. He said that the Palmer (local to International Paper in Corinth) left the old yard, and returned to the new, on cutover day. My question is, that the old AD branch fill is too low for a bridge under it, for the new line. Did they have a temp. bridge over the excavation, for the new main? Did they have a crew ready to demolish it upon cut-over?
One day I was in Saratoga Library. I was in the room that saves local history. They had a newspaper clipping about the relocation project. It showed a photo of the new shop/ yard office and yard under construction. It also showed the building of the rte. 50 bridge, near SPAC. The third photo was of the old line, with the new track waiting to be cut over.
One last point. The new yard has a "Y" on the east side. The tail used to go across West Ave. It then went through the new YMCA. This was to connect to the old yard, as there was the freight house and local customers downtown.