What are the meanings of various signal lights on the railway?

Red means it is forbidden to cross the signal light and stop in front of it. Green means you can go through the traffic lights. The signals of these two colors have the same meaning at all traffic lights. Other colors such as: a yellow light, a blue light, a month white light, two yellow lights, a green light plus a yellow light, green light flashing, yellow light flashing and other signals depend on the position and function of this signal light. For example, blue light has no effect on the trains in the station. When you change the front, it means you can't move forward. etc

Red light: there is a train ahead, and it is forbidden for trains and vehicles to pass this signal.

Yellow light: there is a vacant block ahead, the train slows down and is ready to stop at any time.

Green light: there are more than two empty seats ahead, and the train is running at the specified speed.

One green and one yellow: there are two vacant closed sections ahead, and the train runs at the specified speed.

There are some special expressions that ordinary people are not familiar with:

Two green lights: indicating that the outbound signal is on, allowing access to the secondary line or branch line.

Two yellow lights: indicating that the signal of entering the station or entering the route is open, and it is allowed to enter the line laterally through the first auxiliary turnout in front. If the signal is yellow, it means that it is entering the line through the turnout.

Regarding blue light and white light, it usually works when it is split. When marshalling trains, it is generally called shunting operation, and there are no trains. A train with a train is called a train after it is formed. Blue light has no signal effect on trains. Trains can pass through blue light, but for shunting operation, blue light is a stop signal and white light is an open signal.

Train drivers easily confuse the function of blue light, so drivers are generally divided into drivers who specialize in shunting operations and train drivers.

The red light and the blue light are on at the same time. This situation generally appears in the big overtaking signal on the ramp. In order to prevent heavy-duty trains from starting after stopping, trains are allowed to cross at a speed of no more than 20 kilometers per hour without stopping at the red light, and they are ready to stop at any time.