Nebraska USA challenge

Hi,
i’m doing the USA challenge and i need help with Nebraska. It says i have to upgrade the trade route to iron horse (i do not know if it’s the same in the english version).
I think i have to upgrade the trade route to train, so max level. But i’ve done it like five times, there is a specific civ to do it? Thanks

Make sure that trade route upgrade is called Iron Horse not Iron Llama or Iron Goat etc… I did it several time and when I picked Texas map it work because there final trade route upgrade is called Iron Horse.

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Thank you very much :+1:

Thank you… I did 3 time with the iron lama not knowing what’s wrong