The South Shore Line and the P&W have long been considered the last two remaining interurbans, however each has some characteristics of other types of rail lines. The South Shore, especially with its current passenger equipment is very much like a commuter railroad, while the P&W ( as the Norristown High Speed Line) has elements similar to rapid transit lines. Note that between the somewhat forced retirement of the Bullet Cars and the acquisition of the present Adtranz N-5 cars, SEPTA ran two types of actual rapit transit equipment on that lhe--- ex Chicago Transit Authority PCC rapid transit cars and ex Market-Frankford M-3 ( Almond Joy) cars further emphasising the rapid transit connection. Both lines, though have definate interurban roots.
Please Move to the Rear and Speed Your Ride
( Philadelphia Transportation Company)