DIN V ENV 50121-4:1997 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version ENV 50121-4:1996
2017DIN EN 50121-4:2017 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version EN 50121-4:2016
2016DIN EN 50121-4:2016 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version EN 50121-4:2015
2007DIN EN 50121-4:2007 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version EN 50121-4:2006
2001DIN EN 50121-4:2001 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version EN 50121-4:2000
1997DIN V ENV 50121-4:1997 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus; German version ENV 50121-4:1996
1995DIN V ENV 50121-4:1995 Railway application - Electromagnetic compatibility - Part 4: Standard for emission and immunity of the signalling and telecommunication apparatus; German version prENV 50121-4:1995