This is pretty awesome. Check out this old archive footage of the 3rd Ave El in Manhattan.

The 3rd Ave El was an elevated transit line that was part of the NYC rapid transit system up until the mid 1950′s. It ran along 3rd Ave all the way up to the Bronx and was later replaced by bus lines when it was disassembled and decommissioned by the MTA. If you look at the map below, you can see the 3rd Ave El as a thin line with circle dots on the East side of Manhattan.

Map from NYCSubway.org