说明：  国际标准，需要收费的，现贡献给大家。站长不用修正说明，想要的只要一搜到50121的标准号就会下，根本不会看说明，不想要的看了说明也不会下。 Railway applications - Electromagnetic compatibility Part 2:
( Railway applications- Electromagnetic compatibility Part 2: Emission of the whole railway system to the outside world )