Railway applications – Compatibility between rolling stock and train detection systems – Part 2: Compatibility with track circuits; German version CLC/TS 50238-2:2015
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2016

Railway applications – Compatibility between rolling stock and train detection systems – Part 2: Compatibility with track circuits; German version CLC/TS 50238-2:2010
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2011