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The time interval may be controlled by a level crossing predictor, an electronic device which is connected to the rails of a railroad track, and activates the crossing's warning devices (lights, bells, gates, etc.) at a consistent interval prior to the arrival of a train at a level crossing. [1]
A level crossing is an intersection where a railway line crosses a road, path, or (in rare situations) airport runway, at the same level, [1] as opposed to the railway line or the road etc. crossing over or under using an overpass or tunnel.
When a level crossing activates, the yellow light is usually illuminated for three-to-five seconds and then the two red lights flash alternately for the duration of the closure. The lights are normally rectangular and landscape orientated, but where space is limited or to improve visibility special lights can be fitted that are portrait orientated.
In Norway, level crossings have crossbucks colored in a white background with a red border, with similar lights to the German crossings, although the white light flash when the crossing is clear, instead of a yellow warning light, and the red light flashes, as do the lights on the barriers.
Normally, level crossing warning signals display no aspect (i.e. are unlit). They light up in the front of an approaching train which is the first clue that the system is working correctly. Level crossing warning signals are unrelated to other signals, therefore in case of Osp1 signal a train must proceed at 20 km/h regardless the higher speed ...
A position light signal is one where the position of the lights, rather than their colour, determines the meaning. The aspect consists solely of a pattern of illuminated lights, which are all of the same colour. In many countries, small position light signals are used as shunting signals, while the main signals are of colour light form.
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In 1955 the Minister of Railways John McAlpine intervened to have barriers installed at a busy Riccarton crossing in Christchurch. [10] A level crossing near Gisborne, sees the Palmerston North - Gisborne Line cross one of Gisborne Airport's runways. Aircraft landing on sealed 1310-metre runway 14L/32R are signalled with two red flashing lights ...