That concept is decades old and has been used for small trains in closed areas. There's a decommissioned locomotive on display in Hamburg that was powered by compressed air.
this post was submitted on 28 Oct 2023
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This article is 9 years old and the company's website was last updated 9 years ago.
The locomotive I mentioned was built in 1950:
http://historische-hafenbahn.de/fahrzeuge/triebfahrzeuge/tiefstack.html
I'm sure this antiquity precedes everything that this derelict company has ever made 😉