2008TB/T 2769-2008 Test method of heavy duty railway motor trolley
1997TB/T 2769.9-1997 Test methods and evaluation standards for dynamic performance of heavy-duty railcars
TB/T 2769.9-1997 Test methods and evaluation standards for dynamic performance of heavy-duty railcars was changed to TB/T 2769-2008 Test method of heavy duty railway motor trolley.