Signaling

The colour-light signal sometimes used is known to have no semaphore arm and give both day and night indications by means of red, green and yellow lights. We know some signals to be operated by hand, others to be automatic.

Locomotives on some railroads are known to be equipped with apparatus located in the cab which gives a continuous indication to the engineman identical with that shown. by wayside signals.

By cab signals the engine crew is supposed to be always informed of conditions ahead regardless of the weather, that affects the man's ability to see wayside signals.

Locomotive cab signals are equipped to give audible warnings whenever the aspect changes to one more restrictive.

A protective device is installed on some railroads to apply the brakes automatically and bring a train to a stop if, for any reason, a stop signal should be automatic train control. The first signals installed are known to have been hand operated usually by station employees.

Answer these questions:

1. When do the colour-light signals give indications?

2. What lights are used to give the indications?

3. What are locomotives equipped with?

4. What is the engine crew informed about?

5. What warnings do locomotive cab signals give?

6. What device is installed on some railroads?

7. How is it called?