South Bronx lost their trolley cars after huge snowstorms in late 40s knocked them out of action. Steel wheels on ice and snow is NOT a good idea.
We lived in the Bronx near the Pelham Pkwy. There were Trollies near there at least until 1949 when we moved just over the GWB to NJ.
My relatives stayed in the Bronx off of Pelham Pkwy and about a mile from the Bronx Zoo. I recall Trollies in that area into the early 50’s.