This Standard specifies the emission and immunity requirements for all types of rolling stock. It covers traction stock and trainsets including urban vehicles for use in city streets.
The frequency range considered is from d.c. to 400 GHz. No measurements need to be performed at
frequencies where no requirement is specified.
The scope of this part of the standard ends at the interface of the rolling stock with its respective
energy inputs and outputs. In the case of locomotives, trainsets, trams etc., this is the current collector (pantograph, shoe gear). In the case of hauled stock, this is the a.c. or d.c. auxiliary power connector.
However, since the current collector is part of the traction stock, it is not entirely possible to exclude the effects of this interface with the power supply line. The slow moving test has been designed to
minimise these effects.
Basically, all apparatus to be integrated into a vehicle shall meet the requirements of Part 3-2 of this
standard. In exceptional cases, where apparatus meets another EMC Standard, but full compliance
with Part 3-2 is not demonstrated, EMC shall be assured by adequate integration measures of the
apparatus into the vehicle system and/or by an appropriate EMC analysis and test which justifies
deviating from Part 3-2.
The electromagnetic interference concerning the railway system as a whole is dealt with in
EN 50121-2.
These specific provisions are to be used in conjunction with the general provisions in EN 50121-1.

Customers who purchased DS DS/EN 50121-3-1
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• DS DS/EN 50121-1 : Railway applications - Electromagnetic compatibility - Part 1: General
• DS DS/EN 50121-2 : Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole railway system to the outside world
• DS DS/EN 50121-3-2 : Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock - Apparatus
• DS DS/EN 50121-4 : Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus

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