Well narrow it down a bit. There was signal bridge over the mainlines between West Grand and 20th. Here's a picture I labelled the putative tracks with letters--not the most pristine high resolution Lexus-type aerial photographs, if you know what I mean. This is 1965 aerial photograph. Photobob has a shot from 1962, appears to show five tracks under the signal bridge but maybe a track is hiding he was on bayside.
Anyways, based on Dr. Z's and the SPINS the labelling here is:
A: track 1/westbound electric
B: track 2/eastbound electric
C:track 3/westbound main
D:track 4/eastbound main
E: unknown, not covered in the SPINS
One more word on the SPINS. They show the wb/eb electric lines on one page which shows the area between 7th and 10th Sts.