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The basic signal consists of flashing red lights, a crossbuck and an alarm (either a bell, a speaker that mimics a bell sound or an electronic siren), attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so ...
IRIS (38D: Light-regulating eye part) The IRIS of the eye controls the size of the pupil, the hole that allows light to enter the eye. The IRIS makes the pupil smaller in bright light and larger ...
Explore daily insights on the USA TODAY crossword puzzle by Sally Hoelscher. Uncover expert takes and answers in our crossword blog. ... is May 1. Several U.S. unions have put out a call for ...
Today's NYT Connections puzzle for Wednesday, January 15, 2025The New York Times
A signal light that is considerably smaller and closer to the ground than a high-mast signal; often absolute, and placed within interlocking limits, its aspects tend to differ from those conveyed by a taller signal for certain indications. Also called 'pot' or 'jack'. Dwell time The time a train spends at a scheduled stop without moving.
Os1 there will be stop at the (next) signal. precedes S1 Os2 there will be proceed with Vmax at the (next) signal. precedes a signal with no speed restriction on its near signal: S2, S3, S4 Os3 there will be speed reduction to 100 km/h at the signal. precedes a signal with a speed restriction of 100 km/h on its near signal: S6, S7, S8, S9
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In the very early days of railway signalling, the first coloured lights (associated with the turned signals above) presented a white light for 'clear' and a red light for 'danger'. Green was originally used to indicate 'caution' but fell out of use when the time interval system was discontinued.