Dudley, resilient wheels from PCCs onwards are also made in Czech Republic (of course!):

http://onlinepubs.trb.org/onlinepubs/conferences/2012/LRT/PWilczek-7.pdf

Those on the Forcity also serve as disc brakes:

http://www.bonatrans.cz/ru/kratke-zpravy/new-trams-in-prague-will-run-on-unique-wheels-from-bohumin.html

cheers
Tony P