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A bed frame includes head, foot, and side rails. [1] The majority of double (full) beds and all queen- and king-sized beds necessitate a central support rail, often accompanied by additional feet that extend towards the floor for stability. The concept of a "bed frame" was initially introduced and referred to between 1805 and 1815. [1]
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]
Low – Similar to the standard profiling bed, however the low bed has a minimum platform height of 21cm. Ultra-Low – Designed for use without side rails this bed can be lowered to just 67mm from the floor so that if the user falls from the bed, the impact is minimized, especially when used in conjunction with a crash mat.
A railroad tie, crosstie (American English), railway tie (Canadian English) or railway sleeper (Australian and British English) is a rectangular support for the rails in railroad tracks. Generally laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade, hold the rails upright and keep them spaced to the correct gauge.
A bed base. A bed base, sometimes called a foundation, is the part of a bed that supports the mattress. ... circa 2575-2528 B.C. Bed is 177 cm (5ft 9in) long.
The track bed or trackbed is the groundwork onto which a railway track is laid. Trackbeds of disused railways are sometimes used for recreational paths or new light rail links. Background