Police were called to the station at Greenwood and Danforth Avenues just after 8:30 a.m.
Police say a man, later identified as Timothy Kevin Milley, 54, was "suffering from injuries" and his condition was deteriorating rapidly despite efforts by paramedics to revive him. He was pronounced dead in hospital.
Police conducted a search and arrested Dwayne Barton, 46. He is scheduled to appear in court Thursday morning to face a charge of manslaughter.