Y class or class Y may refer to: Locomotive classes South Australian Railways Y class, a steam locomotive class built in South Australia Victorian Railways Y class, an example of the new policy of standard design principles being adopted by the railways GNoSR Classes X and Y, two similar classes of 0-4-2T steam locomotives NCC Class Y, a class of 0-6-0T steam locomotive NER Class Y, a 4-6-2T steam locomotive SNCF Class Y 7100, a class of small diesel shunters SNCF Class Y 7400, a class of small diesel shunters SNCF Class Y 8000, a class of diesel shunter built between 1977 and 1990 SNCF Class Y 8400, a class of small diesel shunters SNCF Class Y 9000, the new designation for modernized and re-engined Y7100 and Y7400 shunters Tasmanian Government Railways Y class, a type of Bo-Bo diesel electric locomotive Victorian Railways Y class (diesel), a small branch line and shunting unit WAGR Y class, a diesel electric locomotive introduced in 1953 Other uses Y-class lifeboat, a class of small inflatable boat operated by the RNLI of the United Kingdom and Ireland Spectral class Y, spectral classification of a brown dwarf substellar object Economy class (travel class code used by airlines: "Y") Class Y, a capacitor type See also Y (disambiguation) Model Y (disambiguation)