2008TB/T 2769-2008 Test method of heavy duty railway motor trolley
1997TB/T 2769.1-1997 Test methods for heavy-duty railcars Traction performance test
TB/T 2769.1-1997 Test methods for heavy-duty railcars Traction performance test was changed to TB/T 2769-2008 Test method of heavy duty railway motor trolley.