Object 140 was an experimental medium tank developed between 1953 and 1958 in Nizhny Tagil in order to improve/replace the T-54. Two prototypes were built, but in 1958 the project was terminated in favor of the Object 430, better known under his production designation T-55.
- Experimental tank on the basis of the Centurion medium tank. The vehicle was in development from 1956 through Never saw mass production. Technical decisions and innovations implemented in became the basis for Chieftain.