TS 12740-3

TS 12740-3 is a terminology standard for railway applications that defines the terms used for tractive and trailing vehicles and their related equipment. Its purpose is to standardize how these rail vehicle concepts are named and understood in technical communication, helping ensure consistency in design documentation, maintenance records, operation, and training materials.

In general technical context, the distinction between tractive and trailing vehicles matters because they perform different roles within a train formation. Tractive vehicles provide the motive function, while trailing vehicles are hauled or otherwise operated in combination with them. Related equipment covers the connected systems and fittings that support safe and functional rail vehicle operation, such as coupling-related or braking-related terminology, depending on the exact vocabulary used in the standard.

Why railway terminology needs precise definitions

Railway terminology standards do more than label parts: they create a common language for engineers, operators, inspectors, and manufacturers. Clear definitions reduce ambiguity when comparing vehicle types, specifying equipment, or exchanging technical information across projects and organisations. That is especially important in a field where vehicle configuration, function, and interface details must be described consistently.

Subject area covered by this part

• Terms for tractive and trailing vehicles operating on railways
• Vocabulary for equipment associated with those vehicles
• Standardized definitions for technical use
• Common terminology for railway engineering and rolling stock communication