I’ve gotten a lot of material from the site you mentioned, but I'll try the moderators whose names you included to see if they may have more available. There is a lot more out there on the South Shore line, since the North closed to passengers in ‘53, along with the South Beach spur. If you come across anything more, please let me know. If you’d like more info which I’ve dug up, email me and I'll pass it along.
Thanks for the help-
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