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A light shelf is a horizontal surface that reflects daylight deep into a building. Light shelves are placed above eye-level and have high-reflectance upper surfaces, which reflect daylight onto the ceiling and deeper into the space. Light shelves are typically used in high-rise and low-rise office buildings, as well
The vertical light bar in the middle of the signal indicates the maximum permitted speed for the section of track where the lead car is currently located. Cab signaling is a railway safety system that communicates track status and condition information to the cab, crew compartment or driver's compartment of a locomotive, railcar or multiple unit.
A color scroller, color changer, or "scroller" is a lighting accessory used to change color gels on stage lighting instruments without the need of a person to be in the vicinity of the light. [5] It is attached in the gel frame holder on the outside of a lighting instrument, immediately in front of lens assembly.
The most universal type of light is the headlight, which is included on the front of locomotives, and frequently on the rear as well. [2] Other types of lights include classification lights, which indicate train direction and status, and ditch lights, which are a pair of lights positioned towards the bottom of a train to illuminate the tracks.
These lights were officially what made a train a "train", [10] and were originally lit with oil lamps. With the advent of electricity, later caboose versions incorporated an electrical generator driven by belts coupled to one of the axles, which charged a lead-acid storage battery when the train was in motion.
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