At approx 0925 a.m. on Sep 25th, Box 5171 was transmitted for the rubbish fire in the subway tunnel near the Harvard Square station. Third rail power was shut down (& confirmed by CFD third rail testers) and the fire in the tunnel near the "old" Harvard station was quickly extinguished. Engine 9 charged the R23 standpipe from street level at Remington St while Engines 6 & 1, Ladder 3, Squad 3, & Rescue 1 worked in the tunnel to locate, extinguish, and overhual the fire. Ladder 2 stood by as the RIT (rapid intervention team).