In my opinion, the most versatile trolley car is the MTH double truck Brill semi-convertible with DCS. The MTH Brill is representative of many many trolley cars operated in the USA and Canada. The MTH Brill is programmable for loop running with stops, and for end-to-end running with stops.
The overall best trolley cars in O-gauge are Western Hobbycraft cars, but these are no longer being made. They came in conventional operation and with TMCC. Western Hobbycraft cars do show up at swap meets and and on eBay. Running these cars end-to-end of the line will require some electronics to stop and reverse the car's direction.
Avoid trolley cars that have plastic drive gears.
