Editing 4-8-0 (section)

===Mexico===
4-8-0 locomotives in Mexico were almost entirely built in the United States. The first locomotives were provided by the Southern Pacific Railroad to independent and subsidiary railroads such as the Cananae, Rio Yaqui & Pacifico and Sud Pacifico de Mexico. The Sud Pacifico de Mexico used, in total, 14 of the Southern Pacific's 4-8-0s, including a few from CRY&P, all constructed at Schenectady between 1889 and 1895.<ref name="Carling" />

The National Railways of Mexico had four classes of 4-8-0. The first two orders were relatively small locomotives from Brooks in 1897. In 1924, a much larger locomotive was ordered, the PR-7, numbers 5-A to 2856 and weighing 127 tons. Unusually among American-built 4-8-0s, these were intended for express passenger service and therefore had much larger drivers than 4-8-0s operating in the United States, at 67 inches diameter. The cylinders had an unusually square bore and stroke of 28 x 28 inches. Because the firebox was wide and above the frames, the tops of the last set of drivers projected into the firebox, something which was only possible due to them being oil fired.

In 1935, a further five locomotives were built with larger boilers, which increased the evaporative heating surface by 357 square feet and the superheater surface by 172 square feet. These were designated PR-8, numbers 3000 to 3004. At 144 tons, the PR-8 was the heaviest conventional 4-8-0 ever built. The Norfolk & Western's  M2, which is often credited as being the heaviest conventional 4-8-0, weighed {{convert|8470|lb|kg|0|abbr=off}} less than the PR-8.<ref name="Carling" />