You could easily take a regular train, with ease, it is not like the technology will not allow that sort of thing. We have canal boat lifts in this country that vertically lift 50x the weight of what would be considered a heavy train, they have been doing that since the early 1900's too. The technology is absolutely there.
I would assume they are much more complex, need more maintenance and are more expensive to install compared to a traditional chain lift. Requiring much more money to install and operate.