At 4.02.2005 Kontron East Europe finished the biggest project in his history „Extension of a subway train remote control system” – it was the great success of the KEE team specially for the 10 years anniversary of the KEE. The work has been done in co-operation with Warsaw University of Technology - inventors of the remote control system. Beside commercial success it was also big technological step for train control systems in Poland, at station A18 has been installed an original Polish computer based on the interlocking system SIL-4 with voting system 2 from 2 with cold reserve. For communication inside the remote control system Profibus L2 is used, locally for exchanging data Ethernet or RS is used when applicable. The whole communication system is based on fiber optic transmission.