EN 50155 covers all of the electronic equipment used for control, regulation, protection, diagnostics, and energy supply in rolling stock applications. Technical standards address performance, design methodology, verification, implementation, safety, and risk assessment within the context of how. A Traction Electrification System (TES) is the combination of the TPS, OCS, and the traction power return system, together with appropriate interfaces to the TES-related supervisory control and data acquisition system (ECCS Energy command and control system). It. Power distribution provides a constant power supply many aspects of the rail infrastructure; Traction power is a standalone system that is used to power electric trains. Safety-critical infrastructure power is used for train control and signalling equipment such as signalling lights and level. The most important standards for railway operation are EN 45545 (Fire protection on railway vehicles), DIN EN 50155 (Railway applications – Rolling stock – Electronic equipment) and DIN EN 50121 (Electromagnetic compatibility). For the purpose of this Manual, RECOMMENDED PRACTICE is defined as a material, device, design, plan, specification, principle or practice recommended to the railways for use as required, either exactly as presented or with such modifications as may be.