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One feature I went looking for was switches. I was hoping to see how they got the plough to follow when the car faced into a turnout. But there are only two locations from 110th Street to 125th Street where there were switches, and almost nothing is visible at either.
At 117th Street, there was a reverse crossover, a short diagonal track connecting the two main tracks. Some cars ended their runs from downtown at 117th Street, stopping just north of this crossing and then running back through the crossover into the downtown track. The diagonal itself is buried under the much later curbs and paving in the mall, and the scraping just didn't expose either of the switches, so there's nothing to see.
At 125th Street, the track in Broadway ended, with curves both east and west into the 125th Street crosstown line. Broadway cars turned west and ran to the ferry at the Hudson River. The end line of the scraped pavement seems to be just short of the switches, although the exposure of a lot of concrete near the end suggests the 125th Street track may have been removed anyway.
But there was still something odd here, shown above. The conduit slot of the uptown track veers over to one side. Did this somehow help guide the plough through the switch that must have come within the next few feet? Sources indicate there was a "slot switch" to guide the plough, I suppose something like a track switch.