  Today, metro is one of the urban infrastructure and plays an important role
in urban transport. The safety and health of people in a city are always
important, and transport in the metro should also be safe. When subway trains
operate, it is possible to occur various accidents such as an exit from the
rails or collision with a possible obstacle on the rails (human or another
train). In this paper, a model is proposed based on RFID technology in which
the train is equipped with a RFID reader, and a control circuit with a
microcontroller as well as placing RFID active tags at specific points of the
path. When the train approaches the tagged points of the route, the train tag
reader scans the tag number, and then the microcontroller identifies the status
of the environment by retrieving the information from the internal database.
Then, the control circuit adjusts the rotational speed of the electric motor
and the train speed consequently based on that data. In this way, the speed of
the train is adapted automatically and promptly to the conditions and the
probability of an accident in unforeseen circumstances is reduced.
