2018TB/T 1869.6-2018 Transformers for railway signaling Part 6: Switch representation transformers
1997TB/T 2848-1997 BD1 series turnout display transformer
TB/T 1869.6-2018 Transformers for railway signaling Part 6: Switch representation transformers has been changed from TB/T 2848-1997 BD1 series turnout display transformer.