With the development of rail transit technology, more and more data are being transmitted in train communication networks, reflected both in the number of data types and in the amount of data. Traditional train communication networks do not have sufficient bandwidth. We propose a switched Ethernet solution based on virtual links. Using flow shaping and virtual link scheduling techniques ensures that no more than one frame is using the virtual link in each BAT interval, which leads to the determinacy of data transfer. To research the real time performance of this network, we have analyzed the in time reliability and the connectivity reliability of single virtual link scheme, multiple virtual links scheme, and all virtual links scheme in this model, using binary decision diagram, or BDD. We have also confirmed, through network simulation research, that such train communication network based on switched virtual link Ethernet posses high in time reliability and that it is a feasible Ethernet train communication network solution.