That south-to-north rule was pretty inflexible. When the PRR built Suburban Station in 1930 they put in 7 tracks on the north side of the property, with room for 5 more to the south. The original tracks were therefore numbered 6 through 12. When another track was soon added south of 6, it was numbered 5. When the Airport line was being planned, two more tracks were added to the south of 5, numbered 3 and 4. There never was a track 1 or 2. Approaching 30th St. from the south, the tracks were duly numbered from east to west, with 1=nb passenger, 2=nb freight, 3=sb freight, and 4=sb passenger. At BRILL interlocking, where the northbound passenger trains slewed over to the west, the track numbers became 2, 3, 4, 1 from east to west, but that was taken care of by giving the lines two different names, which I don't specifically recall any more, but the tracks leading to the High Line were numbered Line (X) 2 and 3, and those to 30th St. Line (Y) 1 and 4, thus keeping the numbering scheme inviolate. Also, if necessary to add another track south or east of 1, they resorted to "A" or "0" (referred to as "aught" track). For example, the 6 tracks between South Elizabeth and Rahway were designated A, 1, 2, 3, 4, and B. Another little curiosity is that on the PRR it was always No. 1 track, not Track 1.