Well, that opens up another can of worms. Why should it be called Ebicab 700 in Bulgaria, when it's called ATC in Sweden? It's the same system, basically. What about other countries calling their systems ATC? Accoridng to wiki that's (at least) Denmark, Brazil, South Korea, Japan, Australia (Queensland), United Kingdom, and Canada (around Toronto) - and possibly Egypt. It is especially confusing when the tagging guidelines include railway:ebicab=700 (and =900) as a tagging option, referring to Wikipedia as the source of whether a country uses Ebicab or not. Spoiler alert: Sweden and Norway are listed as using Ebicab 700!
I am all for changing ATC to something else, because it is incredibly ambiguous. My preference would be Ebicab 700 or similar, but ATC-SE could also be an option. Simply 'ATC' is too vague.
The discussions never reached a conclusion: https://lists.openrailwaymap.org/mailman3/hyperkitty/list/openrailwaymap@ope... https://wiki.openstreetmap.org/wiki/Talk:Proposed_features/railway:train_pro...
A Swedish discussion didn't either (they did not agree to call it ATC or Ebicab). One user mentioned the example that you call all Lego-compatible building blocks "Lego-bricks" whether they are manufactured by Lego or not. That is a valid point regarcing Ebicab vs. ATC, but to which extent the Lego-analogy applies to this situation I am not sure. https://forum.sparvagssallskapet.se/viewtopic.php?t=42554