The Russian steam locomotive class Izhitsa (ô) was a steam locomotive produced in Russia and the Soviet Union between 1908 and 1918, and between 1927 and 1931. The Russian letter ô can be transliterated as ü. On Russian and Soviet railways, these were the most powerful steam locomotives of type . They were designed by E. E. Noltein and had a 16-ton axle load.
The Russian locomotive class Y (ë) was similar but had a 15-ton axle load. In the period 1909âÂÂ1916, 350 class Y (ë) locomotives were built.