Flanged T rail
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Iron-strapped wooden rails were used on all American railways until 1831. Col. Robert L. Stevens, the President of the Camden and Amboy Railroad, conceived the idea that an all-iron rail would be better suited for building a railroad. He sailed to England which was the only place where his flanged T rail (also called T-section) could be rolled. Railways in England had been using rolled rail of other cross-sections which the ironmasters had produced.
In May, 1831, the first 500 rails, each 15 feet long and weighing 36 pounds per yard, reached Philadelphia and were placed in the track, marking the first use of the flanged T rail. Afterwards, the flanged T rail became employed by all railroads in the United States. Col. Stevens also invented the hooked spike for attaching the rail to the crosstie (or sleeper). At the present time, the screw spike is being used widely in place of the hooked spike, perhaps because it is possible to install the screw spike by using a labor-saving machine that replaces salaried workers.
At the present time, crossties or sleepers constructed of concrete are in use in some places. The use of creosote as a treatment for wooden crossties has been declared to be detrimental to the health of people and plants. The crossties or sleepers are embedded in ballast in order to provide stability and drainage.
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[edit] Joining the rails
The joint where two rails are connected is the weakest part of a rail line. The earliest iron rails were joined by a simple fishplate or bar of metal bolted through the web of the rail. Stronger methods of joining two rails together have been developed. When sufficient metal is put into the rail joint, the joint is almost as strong as the rest of the rail length. The noise generated by trains passing over the rail joints, described as "the clickity clack of the railroad track", can be eliminated by welding the rail sections together forming a continuous rail. One kind of welding is the Thermite welding process.
[edit] Examples of old methods
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A connector that matches rails of different heights |
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RE130 to RE100 |
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Joined electrically |
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Pennsylvania RR standard joint |
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Not made of solid steel |
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Portec patented substance |
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Three wires |
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Short rail |
RusticRail.jpg
Old fishplate |
ShorterPennsylvaniaRailroadfishplate.jpg
Shorter Pennsylvania RR standard joint |
[edit] See also
[edit] External links
- Table of North American tee rail (flat bottom) sections
- ThyssenKrupp handbook, Vignoles rail
- ThyssenKrupp handbook, Light Vignoles rail
- Track Details in photographscs:kolejnice
de:Schiene (Schienenverkehr) de:Gleis it:Rotaia Vignoles mk:Пруга nl:Spoorstaaf nn:Skjene
