If we're seriously comparing game V. reality it's more than just the incline, light transit rail runs in the air (with a considerable amount of strengthened understory) heavy resource ore trains (long or short) just don't (aside from cannot be avoided rivers and chasms).

Although I do recognise the awesomeness of early victorian wide valley crossing bridges (which didn't come cheap, then or now) and the jaw dropping bridging a valley with a canal (water ain't light .. but at least it doesn't vibrate).

https://whc.unesco.org/en/list/1303/

https://www.countrylife.co.uk/out-and-about/the-pontcysyllte...