I can confirm the station configuration from childhood memories. The north side of the bridge was still there, wide enough for one more track IRRC; they took that side down as part of the reconstruction. The stations pictured were gone by the late 70s when I was a kid, but you could see where they were. The granite curb of the eastbound station's sidewalk on the side away from the tracks was still there in a dirt parking lot. The westbound station's basement had been poorly filled, so that the paved parking lot on that side (towards the church, away from the square) had sunk noticeably in a big square. I believe the sunken area was some distance back from the track that was there in the 70s. All this supports all of your conclusions. An additional fact that implies some questions, though, is that I'm pretty sure that even back in the 70s, before reconstruction, the platform was on the north side of the tracks -- right where the more northerly westbound track must have been. So at some point someone made a conscious choice to build a new platform on the north side of a track that had had a platform on the other side of it to begin with. I wonder why?
Other things I remember, that may not be relevant:
The granite stairs to Robert St. on the south side of the tracks next to the bridge over Robert St were fenced off in the 70s. They were reopened as part of the reconstruction. The concrete stairs on the north side of the same bridge were open. The stairs from the platform to the pedestrian underpass (theoretically South St.) on one side of the tracks were abandoned and kind of blocked off. I remember walking by as a little kid and seeing some isolated steps in the middle of a dirt slope. I think that was the north side, but I could be wrong.
The area south of the tracks was a ratty dirt lot. I don't remember if people parked there; I remember being pretty impressed when they built the station with two parking lots and access roads. There were two different steep dirt slopes down to the first block of Belgrade Ave, basically gulleys. That is to say, the whole station area was falling apart. My mom didn' t even like to go through the underpass when we walked to the square.
At the corner of Conway St and the pedestrian walk down to the underpass, on the northern edge of the north side of the station area, there was an old lamppost, similar to the gaslight one in the picture, but electric, with the kind of teardrop shaped frosted glass lamp on it. The post was wood on a cast iron base. It was there, working, into the 90s. Actually, it seems to be in Google street view, too; if anyone lives around there, you could check and see if it's still wooden. It's an odd survival, the only one like it anywhere around until they put some modern all metal ones like it in elsewhere in the square in the 90s as a Main Street project.
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