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Bolt hole crack
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A progressive fracture that originates at a bolt hole and progresses radially away from the hole. the origin is usually stresses along the edge of the hole from the bolt. the stresses may be the result of vertical or horizontal rail movement, improper drilling, a burr on the edge of the bolt hole, or rollingstock impacts. growth may be erratic and accelerated when subjected to additional stresses. upon service failure the rail may break into several pieces. as bolt holes are normally associated with fishplated joints, visual detection may only be possible after removal of plates. the crack may be accentuated by oxidation (bleeding).
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Progressive, английский
A 1 длительный; 2 про- грессивный (ант. regressive) aspect, assimilation, dissimilation
Horizontal, английский
- Горизонталь; горизонтальный
- Горизонталь; горизонтальный 287
- At right angles to the direction of gravity; on the level; parallel to the horizon; neither vertical nor inclined.
- A direction parallel to the horizon, or what is commonly termed lying flat. one of the greatest inconveniences navigators have to struggle with is the frequent want of a distinct sight of the horizon. to obviate this a horizontal spinning speculum was adopted by mr. lerson, who was lost in the victory man-of-war, in which ship he was sent out to make trial of his instrument. this was afterwards improved by smeaton, and consists of a well-polished metal speculum about 3-1/2 inches in diameter, inclosed within a circular rim of brass, so fitted that the centre of gravity of the whole shall fall near the point on which it spins. this is the end of a steel axis running through the centre of the speculum, above which it finishes in a square for the convenience of fitting a
Rollingstock, английский
Any vehicle that operates on or uses a railway track, excluding a vehicle designed for both on- and off-track use, when not operating on the track. a collective term for a group of rail wagons of various types, including locomotives and freight wagons and passenger cars.
Additional, английский
- Дополнительный 33
- Дополнительный; добавочный
Associated, английский
- Соответствующий; связанный; присоединенный
- Experiencing through your own senses (seeing through your own eyes, hearing with your own ears, feeling with your own feelings.)
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Weekly notice, английский
A publication i to advertise changes to, and details of, safeworking arrangements.
Broken foot, английский
A progressive fracture in the foot of the rail with a vertical split. the separation is substantially longitudinal but usually turns out to the edge of the foot. these separations are often called half moon breaks. the cause is usually improper bearing on plates, damage to rail foot or a seam, segregation or inclusion. the crack is usually visible and may be accentuated by oxidation (bleeding)
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