Railway signal

High school (ages 12+)
Transportation

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/railway-signal

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who discovered Railway signal?Early 19th century (mechanical semaphore signals)
2. What is the key principle?Interlocking of signals and points to prevent conflicting train movements
3. How do railway signals keep trains safe?Signals show clear or stop signs, and they are linked to the track so a train can only move when the next section is empty. This keeps trains apart and prevents crashes.
4. What is a semaphore signal?A semaphore signal is an old type of signal that uses a moving arm. When the arm is horizontal it means stop, and when it is angled it means go or be careful.

Interlocking: A safety system that prevents conflicting railway movements by locking signals and points.
Track circuit: An electrical system that detects the presence of a train on a section of track.
Communication-Based Train Control (CBTC): An advanced system using continuous communication for dynamic train movement management.