There is a term, it's "Professional Engineer" or P. Eng. Someone who is a "locomotive engineer" must also be licensed but I think the exception in terms of voc

There is a term, it's "Professional Engineer" or P. Eng. Someone who is a "locomotive engineer" must also be licensed but I think the exception in terms of vocabulary is historical rather than practical. The word may be "common" but it is also regulated and defined in law.