Conrail - Fundamentals Of Train Air Brakes (1981)

Excellent training video from Conrail explaining the fundamentals of railroad air brakes. Covers the functional origins of the Westinghouse air brake system, it's early forms, the triple valve, the AB freight valve, and some further features added to the ABDW. I tracked down a copy of this film in early 2025 after the original reuploader decided to take it down and try to charge me $20 for a copy.