Russian locomotive class Ye

The Russian locomotive class Ye, and subclasses Yea, Yek, Yel, Yef, Yem, Yemv and Yes were a series of 2-10-0 locomotives built by American builders for the Russian railways in World War I and again in World War II. They were lightweight engines with relatively low axle loadings.

Due to the Bolshevik revolution in 1917, 200 locomotives were stranded in the United States; these were fitted with wider tires (locomotive driving wheels had steel tires which were heated to expand them, then driven over the wheels so that they shrank into place. By fitting wider tires with a deeper tread width, the effective wheel gauge could be decreased from the Russian standard of 5 ft to 4 ft 8+1⁄2 in, to fit the American gauge and were sent to various railroads. The locomotives were nicknamed "Russian Decapods."