La Trochita (lit. "The Little Gauge", though known in English as the "Old Patagonian Express") is a 750 mm narrow gauge railway in Patagonia, Argentina using steam locomotives. It is a heritage railway of 402 km through the Andes. The majority of the rolling stock still in use today entered service in 1922 (including all locomotives).

https://en.wikipedia.org/wiki/La_Trochita

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