Found this here https://watchtime.me/life-style/vintage/article/832/a-short-history-of-railroad-watches
"The “Canadian dial” was adopted by the CPR in 1883. This featured 24-hour markings with double Arabic numerals. There was an internal ring of Arabic numerals with 24-13 hours (first printed in black and later in red) and an outer ring that marked the hours from 1 to 12.

This dial configuration came to be known as the“Canadian dial” or “Canadian railroad dials”. The same dial was adopted by Canadian National Railways (CNR), who was also known to use a version where the hour indexes started from 0-11 and 12-23 on the internal ring."

 

@Canuck is our forum expert on Canadian railroad watches. I think he has one or two from that era (maybe not UG though).