Earlier this year, The tracking for SEPTA selector and other agencies were merged into one interfacing to provide one interface . The purpose of this tracking is to offer a transit enthurust friendly alternative to the offical trackers or 3rd party trackers out there.
Recently the tracking has been expanded to nclude several other agencies around this area.
These are as follows:
New Jersey (limited time only)
Delaware (limited time only)
Lancaster (RRTA)
New York MTA and Beeline
Harrisburg (CAT)
To check them out: https://www.philadelphiatransitvehicles.info/Selectors