How many colors are there in the train?

Four kinds. China * * * has four colors of trains, which are green (222B2525b 25T Qinghai-Tibet), slow or fast; Red (25G car, part of 25B car) is mostly fast, but also ordinary fast; Blue (25K carriage) express passenger train; Yellow (double 25). A train, also known as a railway train, refers to a vehicle running on the railway track, which is usually composed of multiple carriages and is one of the important modern means of transportation for human beings.