TS EN 15663

TS EN 15663 defines the reference mass concepts used for railway vehicles from design through acceptance and operation. Its core purpose is to provide a common mass basis for different vehicle states so that engineering calculations, testing, delivery acceptance and operational assessments use the same terminology and comparable reference values. In railway practice, mass definitions are central to load calculations, braking behaviour, performance assessment and consistent vehicle comparison.

How the vehicle mass terms work in practice

The standard identifies three masses: dead mass, design mass and operational mass. In general technical use, such terms separate an empty or basic vehicle condition, the mass assumed for design purposes, and the mass that reflects service conditions. This distinction matters because structural analysis, dynamics, braking and operating scenarios often rely on different reference states, and using one agreed vocabulary prevents ambiguity across disciplines.

What this document contributes to railway engineering

This document is about defining the mass terminology for railway vehicles, not about prescribing a full test method or a complete design rule set. Its value lies in standardising the way vehicle states are named and referenced, which helps manufacturers, assessors and operators work from the same baseline when describing, checking or comparing vehicles.

• Dead mass: the reference concept used to distinguish the base vehicle mass condition.
• Design mass: the mass state used in engineering and design calculations.
• Operational mass: the mass condition relevant to service and in-use operation.
• Single reference value approach: supports consistency across different vehicle states.