At approximately 10:59 p.m., EDT, on Monday, May 18, 2020, Buffalo & Pittsburgh Railroad, Inc. (BPRR) train SIBF, operating timetable northward on the BPRR Machias Subdivision main track, derailed at the north (bumper) end of the short spur (Fisher-Price siding) immediately adjacent to the single track mainline, at Milepost (MP) 17.28 in the downtown area of the Town of East Aurora, New York. At this location, compass and timetable north are almost identical. SIBF consisted of 3 locomotives in the lead and 98 cars, with 32 loaded and 66 empty mixed within the consist. The train was 5,875 ft. long and weighed 6,089 tons. SIBF was operating at an estimated speed of 34 mph on main track when train brakes were placed into emergency and SIBF entered Fisher-Price siding. A total of 15 cars were derailed, including 5 HAZMAT empty tank cars. No material was spilled from these 15 cars.