A couple of points...
1. I've lived and fanned in Philly awhile and thus far (despite the hyper-vigilance of the post-Nine-Eleven mindset) have had no problems photographing transit equipment. (Bob, sorry you guys got hassled, but let's face it, you fellas look like the James Gang. Nice pix.)
2. Philly is home to a diverse array of rail equipment...check out the A5 cars on the Rt 100, the Kawasaki's on subway-surface, Patco across to Jersey, Silverliners on Regional Rail. Lots of stuff to see. Septa.org has downloadable pdf files of route maps... easy enough to cross reference against a street map.
3. Septa Police. Yes, they are "real cops" (as compared to private security or "mall cops"). Months of scanner listening have revealed that they seem to perform a core of basic duties to keep things running smoothly:
a. Finding lost baggage. Commuters, in their hazy dreamstate, often leave their bags on trains. Crews often turn them in to Septa police, or Septa police board trains to look for lost items. Not a glam job, it's true, but does prevent having to call out the bomb-sniffing dogs every time a sleepy yupster leaves his briefacse aboard the R5.
b. Identifying illegally parked vehicles. Watch where you park. These guys get a fair amount of cars towed, and they do run plate checks.
c. Rousting winos from the Concourse. A big job in winter...lots of cold winos seeking shelter and only a handful of cops. I know this keeps the concourse more pleasant for Septa riders, and I really don't sense that the Septa cops take any pleasure in turning the poor out into the cold. Sadly, a defect of the shelter system, not Septa.
d. Addressing vandalism. Here's where I've really heard Septa police make a difference. I can't tell you how many weekends some pork-brains put objects on the tracks. Septa cops drive out along the Regional Rail system, find the trouble spots called in by train crews, ensure that the track is clear, and (if possible) arrest the vandals responsible.
* * *
pdx- Enjoy your visit to Philly. And remember, if somebody gives you the finger, don't be alarmed, it's just their way of saying hello.
-Urban
in the City of Brotherly Love