Market-Frankford Elevated Rail Grinder T15 probably at 69th St. This car is ex-Cincinnati, Newport and Covington KY ("Green Line") 325, purchased in 1946. This car later went to Trolley Valhalla in Tansboro NJ and in 1978 to Middletown and Humelstown RR.
T-15 is now at the Pennsylvania Trolley Museum in Arden PA
Courtesy the Bill Volkmer collection; caption info from Jim Boylan