Simulation of Transient Evacuation and Pedestrian Movements (STEPS); EXIT89; COMPF2; mid-platform train fire in an underground rail station; mass transit station; station occupant load; typical travel speeds and exiting capacities per NFPA 130; tenability/accessibility of evacuation paths; predicted time of accessibility when the circulation stairs are affected by smoke; configuration of station evacuation scenarios; comparison between exiting time predictions from STEPS and NFPA 130