It contains a description of  basic performance functions and features of implementation of a microprocessor system of interlocking of marshaling yard of Northern yard of Krasny Liman station of Donetskay railway. Presently relay systems of automatic marshaling yards interlocking is implemented at major part of sorting yards of Ukraine (YAI). One of the main objectives in development of railway transport is creation of MP MYAI with the subsequent integration into ACS switch yards (ACS of CC).Today the works of implementation of MP YAI are carried out at Northern yard of Krasny Liman station of the Donetsk railway . Start up and commissioning are planned for 2007. Northern Yard has two humping and two detaching ways. The ...