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- Q331879 subject Q15196197.
- Q331879 subject Q6994524.
- Q331879 subject Q7153751.
- Q331879 abstract "A track transition curve, or spiral easement, is a mathematically calculated curve on a section of highway, or railroad track, where a straight section changes into a curve. It is designed to prevent sudden changes in lateral (or centripetal) acceleration. In plan (i.e., viewed from above) the start of the transition of the horizontal curve is at infinite radius and at the end of the transition it has the same radius as the curve itself, thus forming a very broad spiral. At the same time, in the vertical plane, the outside of the curve is gradually raised until the correct degree of bank is reached.If such easement were not applied, the lateral acceleration of a rail vehicle would change abruptly at one point – the tangent point where the straight track meets the curve – with undesirable results. With a road vehicle the driver naturally applies the steering alteration in a gradual manner and the curve is designed to permit this, using the same principle.".
- Q331879 thumbnail Easement_curve.svg?width=300.
- Q331879 wikiPageExternalLink books?id=ZVZCzW2codgC.
- Q331879 wikiPageExternalLink PGChapter6.pdf.
- Q331879 wikiPageWikiLink Q10676734.
- Q331879 wikiPageWikiLink Q11376.
- Q331879 wikiPageWikiLink Q131251.
- Q331879 wikiPageWikiLink Q1324959.
- Q331879 wikiPageWikiLink Q1426166.
- Q331879 wikiPageWikiLink Q147572.
- Q331879 wikiPageWikiLink Q15196197.
- Q331879 wikiPageWikiLink Q1550173.
- Q331879 wikiPageWikiLink Q160342.
- Q331879 wikiPageWikiLink Q17423459.
- Q331879 wikiPageWikiLink Q207527.
- Q331879 wikiPageWikiLink Q232149.
- Q331879 wikiPageWikiLink Q34929.
- Q331879 wikiPageWikiLink Q41299.
- Q331879 wikiPageWikiLink Q4260703.
- Q331879 wikiPageWikiLink Q43260.
- Q331879 wikiPageWikiLink Q477862.
- Q331879 wikiPageWikiLink Q4799825.
- Q331879 wikiPageWikiLink Q5251839.
- Q331879 wikiPageWikiLink Q580253.
- Q331879 wikiPageWikiLink Q6058710.
- Q331879 wikiPageWikiLink Q62912.
- Q331879 wikiPageWikiLink Q6994524.
- Q331879 wikiPageWikiLink Q7153751.
- Q331879 wikiPageWikiLink Q755003.
- Q331879 wikiPageWikiLink Q7604.
- Q331879 wikiPageWikiLink Q918587.
- Q331879 comment "A track transition curve, or spiral easement, is a mathematically calculated curve on a section of highway, or railroad track, where a straight section changes into a curve. It is designed to prevent sudden changes in lateral (or centripetal) acceleration. In plan (i.e., viewed from above) the start of the transition of the horizontal curve is at infinite radius and at the end of the transition it has the same radius as the curve itself, thus forming a very broad spiral.".
- Q331879 label "Track transition curve".
- Q331879 depiction Easement_curve.svg.