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The appropriate thickness of a layer of track ballast depends on the size and spacing of the ties, the amount of traffic on the line, and various other factors. [1] Track ballast should never be laid down less than 150 mm (6 inches) thick, [5] and high-speed railway lines may require ballast up to 0.5 metres (20 inches) thick. [6]
A track crew in Louisiana adjusting a railroad track using lining bars, in 1939. The most fundamental maintenance of way task is the construction, repair, and replacement of the track and its supporting ballast and grade. In the early days of railroading, this task was almost entirely completed by manual labor.
A ballast regulator at work in Spain. A ballast regulator (also known as a ballast spreader or ballast sweeper) is a piece of railway maintenance equipment used to shape and distribute the gravel track ballast that supports the ties in rail tracks. They are often used in conjunction with ballast tampers when maintaining track.
Combined with water in the ballast, these fines stick together, making the ballast like a lump of concrete. This hinders both track drainage and the flexibility of the ballast to constrain the track as it moves under traffic. [2] Ballast cleaning removes this worn ballast, screens it and replaces the "dirty" worn ballast with fresh ballast.
A railway track (CwthE and UIC terminology) or railroad track (NAmE), also known as permanent way (CwthE) [1] or "P Way" (BrE [2] and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers (railroad ties in American English) and ballast (or slab track), plus the underlying subgrade.
LORAM Ballast Cleaner in Winnipeg, Manitoba, Canada on July 4th, 2019. The company's first mechanical products were the Mannix Sled and Mannix Plow, [6] both developed in the late 1950s. The Mannix Sled was a device towed behind a locomotive which raised the rails and ties and cleared the ballast between the ties (a process known as ...
Grooved rail, used when track is laid in places traversed by other vehicles or pedestrians. A grooved rail, groove rail, or girder rail is a special rail with a groove designed for tramway or railway track in pavement or grassed surfaces (grassed track or track in a lawn). The head on the right-hand side of the rail bears the vehicle's weight.
Track maintenance and renewal trains often consist of many pieces of separate equipment that are capable of servicing specific track components. [3] Ballast regulators - Distributes ballast to a desired shape and position. [3] ballast tampers - tamps or levels and compacts ballast to make the trackbed more secure. [3]