Abstract: The train control and service network (TCSN) is different from the traditional train communication network. Taking full account of the more widely used passenger service business, TCSN ensures the transmission of train control business, implements integrated transmission of train control and service traffic. TCSN uses a differentiated service model, the network can generate traffic bursting because the actual traffic arrival rate of the TCSN may not be correspond to the traffic rate specified by the Service Level Agreement(SLA). This article presented a new multi-level token bucket traffic monitoring scheme, which monitored Assured Forward(AF) business traffic by two-level allocation, tinted traffic packets, tinted traffic packets and managed traffic queue after traffic monitoring, implemented the dynamic monitoring of TCSN traffic and the reasonable distribution of network resources.