This standard applies to No. 13 top-action couplers and No. 13 bottom-action couplers for standard gauge railway machines and freight cars.
TB/T 3044-2002 history
2019TB/T 456.2-2019 Automatic coupler buffer devices for rolling stock - Part 2: Automatic couplers and accessories
2002TB/T 3044-2002 Basic size and performance of No. 13 coupler
TB/T 3044-2002 Basic size and performance of No. 13 coupler was changed to TB/T 456.2-2019 Automatic coupler buffer devices for rolling stock - Part 2: Automatic couplers and accessories.