Noel is correct, the Rochester Subway was the last trolley operation outside of New York City. Rochester Subway abandoned passenger service in 1956. Electric freight operated by RTC continued one more year until 1957. While the majority of trolley service was abandoned in New York City prior to 1948, the last trolley to operate in New York City was the Queensboro Bridge line, which quit in 1957. The NFTA MetroRail in Buffalo is a light rail transit system, which opened in 1984. If you want to split hairs, the Rochester subway and other streetcar and trolley lines ran on single-contact trolley wire. The NFTA line and other light rail lines are built to a heavier standard and operate off of tensioned compound catenary systems, which rely on messenger and contact wires as part of the structure. The only private trolley operation in New York State is the trolley at New York Museum of Transportation, which had its first test run off live overhead wire in 2001, and has operated regularly since 2008.
The Rochester Subway was designed for a time when people lived at the city's edge, and shopped and worked either downtown, at Kodak, or General Motors (all served by the Subway). Not sure how successful it would be today on the same route, you could speculate that any of the proposed extensions would have helped/hurt, but the fact of the matter is that it is gone now. Any new opportunities for rail transit will be based on new routes reflecting current population centers and development.
I like trolleys.
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