The integration of railway transport in Riga city public transport control is important for passenger’s service, using existing recourses. However the integration of transport control systems has just started to be developed. The first implemented system was bus control system – ASOS. The three levels of integration in vehicle control, transport mode control and all city transportation system control in one system are described. The decision making procedures for predefined conditions, using decision trees, takes into account risky conditions by definition of possibility to choosing one of alternatives. The dynamic control for transport modes in pre - defined time interval and composite the final control procedure for each transport mode and harmonize the motion with the aim to arrive transport in time and harmonize railway and public transport motion. An effective tool of research of problems of optimum control is the principle of dynamic system control, representing a necessary condition of optimality in such problems. The example of Riga city transport system is described.