Hey Mark,

There's a tunnel you can walk through under the tracks to get to different sides of the train platform. In the part of the tunnel directly below the tracks is where it's written (in 6ft high letters on the wall).

It's a recurring problem. Once a week it's painted over. Usually less than a week later there's graffiti there again. It's not nice graffiti either, usually it's just a crude scribble that looks like someone spent about 5 seconds on.

Do you know if this is a city responsibility, or should it be directed to SEPTA?

This sounds like it is an ongoing problem. Someone could set up a custom "watch area" for SEPTA (or whichever other official is in charge) just in the areas right around each station, so that they could receive direct notice immediately when issues such as this are reported.

Philly311 has been very responsive but the removal could happen more quickly if the issues go directly to the right person.

The key to addressing graffiti problems is to have the graffiti removed as soon as possible. If you wait a week, people will continue to come back for more. In areas where graffiti is removed within hours (e.g., near BIDs), it typically stops happening.