Website:
http://www.virginiacitymt.com/AlderGulch.asp (Website)

Description:
The history of the new locomotive began in 1909 when the Ferrocarril Mexicano (Mexican Railroad) ordered four 30 inch gauge engines from the Baldwin Locomotive Works of Philadelphia for use on their Zacatlan Branch. The locomotives were to be wood burners with Baker-Pilliod valve gear, 15 x 20 inch cylinders (Baldwin class 10-24 1/2 E Numbers 119, 128 to 130), and 160 lbs. boiler pressure, giving a tractive force of 17,000 pounds. The weight was to be 83,000 lbs. Maximum track curvature was to be 197 feet radius.