Where was the first commercial railway line built?

Question

Which railway has the highest line in South America and the second highest in the world, second only to the one which connects Qinghai in China and Lhasa in Tibet?

Answer 1

1812 - First commercial use of a steam locomotive on the Middleton Railway, Leeds. Matthew Murray of Fenton, Murray and Wood, in Holbeck, designed a locomotive with a pinion that meshed with a rack. Murray's design was based on Richard Trevithick's locomotive, Catch me who can, adapted to use Blenkinsop's rack and pinion system, and probably was called Salamanca. It was the first two-cylinder locomotive.

Answer 2

Calcutta-Allahabad-Delhi line.