What indications do signals show and what do they mean?

July 14, 2019, 2:41 PM
Share

The most common indications shown by various signals are the following:

Stop This requires a train to stop dead and not pass the signal except under special instructions or emergency procedures. (Stop signals may be passed after halting and waiting in automatic block territory – usually 1 min. during the day & 2 min. during the night.) This indication is also known as Danger.

Caution This allows a train to proceed past the signal with caution (at reduced speed), being prepared to stop at the next signal. It can mean that the next signal is at Danger, or that the track ahead has speed restrictions.
Attention This allows a train to proceed past the signal, being prepared to slow down to an appropriate speed for the next signal. It means that the next signal may be at Caution, or may guard a divergence which requires reduced speed (in which case a stop signal at the divergence will indicate the route for which points are set).

Proceed This allows the train to proceed past the signal without slowing down or stopping.

Proceed Slow This indication, shown only by calling-on signals, allows a train to pass the signal at slow speed after stopping, being prepared to stop short of another train or an obstruction on the same track.

Proceed Slow for Shunting This indication, shown by shunting signals, allows movement past past the signal with caution for the purposes of shunting. This is the most common indication used when a shunt signal is pulled off, and in fact most shunt signals can only show this indication (other than Stop).

Proceed for Shunting This indication, shown by shunting signals, allows movement past past the signal for the purposes of shunting, at speeds higher than allowed with the indication Proceed slow for shunting. This indication is not widely used, and appears in 3-aspect position light shunt signals.

Source – IFRCA.org

Share

This entry was posted in 2 Railway Employee, STUDY NEW, General