Brooklyn, as we recall, has modified Heyes "Type WA" bumping posts. These are generally the strongest available in the industry. They are installed with "middle rails," which are two guard rails placed inside the rail gauge to help keep derailed truck or wheel-set guided straight and keep the rails in gauge if the block is struck. Anyone interested can find structural information at the manufacturer's site:
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Track 6 is the southernmost station track and has a capacity of six MU cars. The highest allowable speed for quite a distance is 5 MPH. The LIRR's automatic speed control system, which is operable in this area enforces the speed to a maximum of 15 MPH.
The concrete high level platform wraps immediately behind the bumping block. Photos show that the train probably traversed the block, which revolved under the pilot and lifted the front car body somewhat. It's possible that the car then came to rest at the concrete platform, which is usually what happens when trains over-run the blocks in Brooklyn.
Brooklyn is a particularly dangerous place for this type of incident as the majority of passengers walk up to disembark from the head car prior to its arrival in the station. On this train, most likely carrying about 450 passengers, the head car would have been crowded with standees awaiting to walk the fifty feet to access the IRT Subway upon arrival. The sudden stop would have knocked many people over and probably caused the reported injuries. After the train climbed atop the block and perhaps the concrete platform, its head car would have been elevated a foot or two making exiting difficult for the frightened passengers. Combined with the cloud of dust, smoke from shorted shoe fuses and some panicking passengers, it appears that one of the middle or running rails pierced the car body floor when the block was rotated under the train.
With this damage sustained, the riders were truly blessed to have avoided more serious injury.
Let's see what the investigation uncovers.