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I don't know how long the Broadway paving project will take, but if you miss it, there is a permanent exhibit located in 12th Avenue between 125th Street and St Clair Place, that is, almost under the Riverside Drive Viaduct. This is a turning loop built in 1910 at the end of the 125th Street crosstown line that has never been paved over, probably since it is in a "safety zone" between traffic lanes that have been repaved.
It's the same thing as on Broadway: paving stones, rusty iron rails, a conduit slot, pairs of insulator manholes every 5 feet. It also features some curvature and a long narrow hatch at one point along the conduit.