More context: They use rack-and-pinion railways in Switzerland [0][1] to accommodate the steep grades. > The trains are fitted with one or more cog wheels or p

More context: They use rack-and-pinion railways in Switzerland [0][1] to accommodate the steep grades. > The trains are fitted with one or more cog wheels or pinions that mesh with this rack rail. This allows the trains to operate on steep grades above around 7 to 10%, which is the maximum for friction-based rail. [0] [0] https://en.m.wikipedia.org/wiki/Rack_railway https://en.m.wikipedia.org/wiki/Rack_railway [1] https://en.m.wikipedia.org/wiki/Category:Rack_railways_of_Switzerland https://en.m.wikipedia.org/wiki/Category:Rack_railways_of_Sw...