The TR-85 is a main battle tank designed for the armed forces of Romania. Based on the TR-77-580 (Romanian-built version of the Soviet T-55 tank), the TR-85 tank was developed from 1978 to 1985 and produced from 1986 until 1990. A modernization program was initiated in March 1994 in order to upgrade the TR-85 tanks to NATO standards. The result was the TR-85M1 main battle tank, currently the most modern tank in service with the Romanian Land Forces.