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  2. Glossary of rail transport terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_rail_transport...

    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.

  3. All clear - Wikipedia

    en.wikipedia.org/wiki/All_clear

    All clear is the signal, generally given by an air raid siren, which indicates that an air raid or other hazard has finished and that it is safe for civilians to ...

  4. North American railroad signals - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    To avoid phantom indications the design makes use of a special inverted toric lens (i.e. a single clear Fresnel lens mounted step sides outwards) with a portion of the lens steps painted black. A light yellow tinted conical glass with frosted tip was chosen, as this color was determined to have the highest visibility under fog conditions based ...

  5. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_signalling

    Neither train is permitted to move before the other has arrived. In the US, the display of two green flags (green lights at night) is an indication that another train is following the first and the waiting train must wait for the next train to pass. In addition, the train carrying the flags gives eight blasts on the whistle as it approaches.

  6. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Cryptic crosswords often use abbreviations to clue individual letters or short fragments of the overall solution. These include: Any conventional abbreviations found in a standard dictionary, such as:

  7. All Clear (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/All_Clear_(disambiguation)

    All Clear is a volume of Blackout/All Clear, a science fiction novel by Connie Willis. All Clear may also refer to: Operation All Clear, a military operation conducted by Royal Bhutan Army forces; All clear, a signal given by an air raid siren to indicate that a threat has passed

  8. Blackout/All Clear - Wikipedia

    en.wikipedia.org/wiki/Blackout/All_Clear

    Blackout and All Clear are the two volumes that constitute a 2010 science fiction novel by American author Connie Willis. Blackout was published February 2, 2010 by Spectra . The second part, the conclusion All Clear , was released as a separate book on October 19, 2010. [ 1 ]

  9. Direction, position, or indication sign - Wikipedia

    en.wikipedia.org/wiki/Direction,_position,_or...

    A direction sign, more fully defined as a direction, position, or indication sign by the Vienna Convention on Road Signs and Signals, is any road sign used primarily to give information about the location of either the driver or possible destinations, and are considered a subset of the informative signs group. Direction signs are far more ...

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