And what could be wrong with that? I stumbled across this delightful image on a Russian Livejournal, someone who calls himself Lord K. The overall theme seems to be 20th century images, most but not all of cool techno stuff.
I do not know the date of this ad, though I'll guess late 30s or 40s from the design of the locomotive, which looks much like spaceships illos of that era at Atomic Rockets. Surely it is pre-1955, based on the monorail technology - resembling a conventional track, complete with ties, instead of the Alweg style, wrapped around a concrete girder on pylons, that Disneyland made the iconic image of Futuristic rail transport. Disney doesn't have to answer for monorails after all; obviously they were already with us, or would be in the Future.
But whoever wrote the ad copy got something right. This was the dim and distant mid 20th century, when women apparently neither thought about tomorrow nor bought their own whiskey, but 'men who think about tomorrow' were thinking of trains going 200-300 mph.
Trust me, though - it is a lot simpler with two rails, especially for switches AKA turnouts.
Related post: Take a quick virtual ride on the Eurostar, at a mere 150 mph. (Average - the top speed must be faster.)