Today on the way home from work the laying of a single track continues and is all the way up to about the middle of the Sullivan MBTA station. The track is being put down next to the fence along the Orange line. There was also trucks doing grading and leveling work on the other side of the new track.
The correct term is "re-laid" but yes they are concrete and they came out of the Lowell Line, which had a small segment of concrete ties in the area where GLX is rebuilding the line. They'll last a considerable amount of time in a yard track.
A switch is now being installed at the northern end of the Yard 21 track. With a single track stub that would hold at least one locomotive for running around. If the Orange Line has a slow order going south I should be able to get a picture.
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Track work continues in the north part. The switch is done and the 2nd track has been re-laid up to about the Mystic Ave bridge. No progress on the track next to the Orange line in the past week. Regarding the single track stub at the north end it is about 250 feet long and could hold three engines.