this is the repealed law:
https://www.canlii.org/en/on/laws/stat/rso-1990-c-p55/latest/rso-1990-c-p55.html

and, according to canlii, my hunch was correct - it was indeed replaced with this one, as i suspected:
https://www.canlii.org/en/on/laws/stat/so-2014-c-15-sch-3/latest/so-2014-c-15-sch-3.html

the new law would not include railways in it's scope. so, what i was citing has been repealed, and i should stop citing it.

but, i still need to find the connection between the public works protection act and the charge of terrorism, which i must have read in a case...

i'm notorious for not keeping track of sources, at this point, aren't i? i'm bad at this, i admit it. but, i'll argue it's more important to remember the content of what you're reading than it's title or author...