The risk is bound to exist given the ubiquity of technological facilities. That said, you mentioned Nortel, but in the 1970s and 1980s, it was the largest private-sector employer of engineers in Canada and a world leader in this field. It went completely bankrupt as a result of its own mistakes, but also because its intellectual property had been stolen by hostile actors.
So, there's a great risk, not only to the public transportation you mentioned, but also to Canadian businesses. Who will invest in research and development in Canada knowing that intellectual property will be stolen by competitors?