block signal

noun

1. a fixed railroad signal governing the movements of trains entering and using a given section of track.

Other Words From

• block signaling noun

Word History and Origins

Origin of block signal¹

First recorded in 1880–85

Example Sentences

In most nerve agent fatalities, death occurs after the agent binds to enough AChE to block signal transmission from the brain's respiratory center to the diaphragm, paralyzing the muscle that's vital for breathing.

From Science Magazine

When, far up the track, the block signal snapped from red to green and the long, stabbing probe of the headlight sheered the bend and blared on the station, men looked at their watches and said, “On time.”

From Literature

Those used at the moment by Apple on Samsung rely on a signal being sent to the phone to lock it, or a password to keep out unwanted users, and experts have warned that turning a phone off or placing it in airline mode can block signal from reaching it.

From The Guardian

Trains moving on caution card must expect to find main track occupied at all stations regardless of the position of block signal.

From Project Gutenberg

One of the important uses of electricity is in connection with the electric block signal.

From Project Gutenberg