They started doing that a few years ago. Can see it in action on the main bridge going towards Glasgow Central as there's lots of points (15 platforms), seemed to help.
Alternately, I've seen videos in the likes of Chicago where they've literally installed pretty much bunsen burners and set the rails on fire to deal with the winter. https://www.youtube.com/watch?v=z76ywZDXyPw
Alternately, I've seen videos in the likes of Chicago where they've literally installed pretty much bunsen burners and set the rails on fire to deal with the winter. https://www.youtube.com/watch?v=z76ywZDXyPw