the source everyone reports for this PDF is gone, and it's not exactly easy to find swiss train law documentation when you don't even speak german
but here's a current link: https://www.hech.ch/wp-content/uploads/2018/07/I-30111_09122018_Anhoerung.pdf
page 123, section 4.8.4 "Zugbildung"
@Nikolai_Kingsley is is entirely possible that my two months of duolingo courses i did two years ago, combined with google translate, is not enough to produce a german sentence that doesn't sound weird
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