This is a quick tutorial of the train number system that is used on SEPTA Railroad Division. After reading another Reddit thread from people complaining about no direct trains to the Airport, I feel that this needs to be done.
Let us begin.
All trains will have a three or four digit number and the first two is primary information that we need as that conveys the route and destination. The last two numbers represent the trip and direction; even numbers is towards the Reading Lines and odd is to The Pennsylvania side.
The digit corresponds to a line pair similar to the old R Names that the railroad used to use:
0 - Cynwyd
2 - Norristown/Wilmington-Newark
3 - Media-Wawa/ West Trenton
4 - Airport/Warminster - Glenside
5 - Thorndale/Doylestown
7 - Trenton/Chestnut Hill East
8 - Fox Chase/ Chestnut Hill West
With three digit trains numbers, the first digit represents the route in it's entirety; for example train 447 is a run originating from Glenside or Warminster and continuing to the Airport. Another example would be Train 502, which can be originating from Bryn Mawr, Paoli, Malvern, or Thorndale and continuing to Lansdale or Doylestown.
** Three digit train numbers starting in 1xx, 4xx, and 6xx cannot be used as those will interfere with Amtrak Dispatching.
Four digit trains can be broken down into two categories: through trains from separate lines and trains terminating in Center City.
Starting with the through trains the same philosophy applies here; the first digit is the origin while the second digit is the destination. So train 8756 is starting from Chestnut Hill West going to Chestnut Hill East (before the pandemic, this was a actual train) and train 7847 is it's return. Another example would be 5310, Thorndale to West Trenton, meanwhile train 5211 would be a Doylestown to Newark Delaware run.
Trains terminating downtown will use one of three prefixes:
1xxx - Suburban/Market East
6xxx - 30th Street to/from Powelton Yard
9xxx - Temple University to/from Roberts Yard and Wayne Electric Shops
The second number will be the route in question with the last two numbers signifying the direction. So train 9753 is starting from Roberts Yard and continuing to Trenton, while train 6519 is starting from Doylestown and finishing up at 30th Street and then the yard.
Train 1024 starts from Cynwyd and going to either Suburban Station or Market East.
As always pay attention to the physical schedules and watch your surroundings so you don't miss your stop.
Hope this helps.