Head rod

Head rod

The switch rod nearest the point of a switch, usually placed between the two head block ties.

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Part of Speech: noun
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Industry/Domain: Railways
Category: Railroad
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Related terms

head rod

Railways; Railroad

The switch rod nearest the point of a switch, usually placed between the two head block ties.

rod

Forest products; Forest engineering & harvesting

Surveying instrument made of wood and graduated in feet and tenths of a foot. Used with various leveling instruments to determine differences in elevation between two points.

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Metals; Steel

Round, thin semi-finished steel length that is rolled from a billet and coiled for further processing. Rod is commonly drawn into wire products or used to make bolts and nails. ...

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Physics; Color science

One of the two main classes of photoreceptor found in the vertebrate eye. Rods are very sensitive to light but fail to produce a usable signal at high light levels. They mediate ...

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Health care; Optometry

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Metals; Aluminum

A solid wrought product, long in relation to its cross-section, which is not less than 0. 375 inch in diameter. (Smaller sizes are classified as wire).

absolute blocking

Railways; Railroad

A control arrangement for rail traffic in which a track is divided into sections or blocks upon which a train may not enter until the preceding train has left.

gotthard base tunnel

Railways; Railroad

Currently the world's longest at 35.4-mile (57-kilometer), the Gotthard Base Tunnel through the Swiss Alps was first conceived in 1947 by engineer Eduard Gruner. The project ...

Gotthard Base Tunnel

Railways; Railroad

Currently the world's longest at 35.4-mile (57-kilometer), the Gotthard Base Tunnel through the Swiss Alps was first conceived in 1947 by engineer Eduard Gruner. The project ...

insulated switch

Railways; Railroad

A switch in which the fixtures, principally the gage plates and the switch rods connecting one rail to the other, are provided with insulation so that electric currents will not ...

turnout number

Railways; Railroad

The number corresponding to the number of frog used in a turnout.

insulating rail joint

Railways; Railroad

Sometimes called Insulated Joint. A rail joint designed to stop the flow of electric current from rail to rail, as at the end of a track circuit, by means of nonconductors so ...

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