Thank you for posting the links to the pictures. Your link below caught my eye (the "one more"):
http://community.webshots.com/photo/312 ... tteFCJaecv
If your date is correct (8/4/74), then it seems to be an Sunday extra coming out of Pavonia. Hard to say exactly to where, but the gon in the front suggests possibly a Salem extra, with a block of cars to set out at Woodbury for WY-33 to pick up on Monday morning. Just a guess.
However, I took the liberty to browse through your Webshots album, and the next picture in the album was the one that really got my attention:
http://community.webshots.com/photo/312 ... umsoJwmRlX
It's a closer shot (zoomed?) of the same train ---- That's me in the brakeman's seat on the 2000!
Thank you for sharing it.