The exact policy depends on the province but an American engineer that passed the FE exam can easily become an Engineer in Training (EIT) and an American engineer that has more than 4 years work experience (reporting to an engineer) can easily become a Professional Engineer (P.Eng) in Canada.

In other cases, they look at your academic and work history, and may ask you to take FE and/or PE exams and/or an ethics exam and may ask you to complete specific engineering courses. It's actually possible to obtain accreditation through work experience alone (10 years IIRC).

You can even take the FE and PE exams in Canada for this purpose (and for Canadian grads that want to work in the US). Note that if you get an engineering degree in Canada, you don't have to take the FE exam or equivalent to start as an engineer in training, because the engineering schools themselves are accredited with very similar curriculum.

Personal anecdote: I have a Canadian engineering degree but I personally had no problem using work experience abroad as part of my four years experience towards my P. Eng.

They cannot practice, as in they cannot stamp drawings, or in other words take responsibility for things that require an engineer to take responsibility for. What it means in practice is that either they work in a sector that does not require stamping drawings, or a P.Eng. has to review their work and stamp their drawings.

If you work in tech writing software or building hardware this has no impact on you at all. You can still do the exact same stuff, you just can't have 'Engineer' in your title. This stuff only really comes into play for say civil engineers signing off on the final design of a project or a chemical engineer doing the same for some plant.

Yes, that's correct. Although is fairly easy to get accredited if you are a member in order of the state association of engineers.

It does apply to the railroad in general but there are a few job titles grandfathered in that don't require a P. Eng. such as locomotive engineer (the other common one is power engineer) because those job titles were used before the engineering regulations existed and the job descriptions don't match the modern definition of engineering in Canada.

For engineering disciplines in the railroad industry such as structural, mechanical and electrical, a P. Eng. is indeed required.

He likely founded the association that sold accreditations.