No idea. The USA maybe with their double stacked container Trains?
Or Russia..?
View attachment 47448
Picture of a rocket being transported to a launchpad in Kazakhstan.
Former Soviet Union (Russia, etc.) is generally quoted as being the largest (but note the picture of rocket is on an industrial line at the Cosmodrome, not 'national network'); other contenders are North America, some Australian lines, and Eurotunnel.
