I'm 17 and i'm from Philly (Still live here). I grew up in southwest philly, and southwest philly is known for the trolley lines. The trolley's was and is the way everyone in and around Southwest get in to downtown (On A Direct Note) Other options too. The trolleys have their own tunnel then they share it with the "EL". But when i was maybe around 3...i was just fascinated with them. I wld ride them and all i know is that it was this big o machine that looked interesting. I wld sit at the back and look out the window and watch the stick up on the wire. I used to go over our cousin house also in SW, and W. Philly and they lived on the street where the trolleys ran , i wld just sit outside for hours and watch them go by and not get bored. I think they are fun to ride, watch, know how they work. Whenever i see lil kidss now so interested in trains,and trolleys (either in the subway, or outside) it just brings a smile to my face and reminds me of how i was when i was their age.