PURPOSE: To improve the extent of operating efficiency by installing an intermediate signal station, equipped with a controller with a function similar to that installed in each station, between two stations, and when a preceding train run past this intermediate signal station, making it so as to give such a command as starting a succeeding train.

CONSTITUTION: In a device which sets an interval between two stations A and B connected by a single track down to one block section and thereby performs operational control over a train, when a trainman of a train (A) in stoppage at the A station pushes a start button, discrimination data of the train (A) are transmitted out of an antenna (b) from a mounted apparatus (a), giving these data to a controller 1A as a station unit. This controller 1A transmits its identification code to the B station via a transmission line 2. At the B station, when arrival of the train (A) with the said identification code is checked, blocking between these A and B stations is released. In this case, an intermediate signal station C is further set up in an intermediate position between these stations A and B, and when passage of the train (A) is detected hereat, such a command as starting a succeeding train at the A station is made so as to be given.