Philadelphia Suburban Transportation Company Red Arrow Line - In marked contrast to modern trolleys like the Brilliners and Master Units described above, the Brill &quot;Center Door&quot; car seen here was typical of suburban trolleys built around 1920. These tended to be large, heavy, double-end cars, with passengers entering and exiting via doors located at the center of the car. When this car was ordered in 1926, its design was already &quot;conservative&quot; to put it mildly.