The 63 street tube would be the only spot on that line that would need a rescue engine As Patrick said that tube is one and the same as the NYC subway above it There are staircases that connect both and passengers can easily be evacuated to a rescue train on the tracks above them The subways use diesels all through the system. The newer diesels are lower emission. The tunnels in Manhattan all have emergency exits pretty close together so a rescue diesel is a luxury not a necessity
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