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CE 515 Railroad Engineering

CE 515 Railroad Engineering. Track Source: Armstrong Ch 3, AREMA Ch. 3, REES Module 2. “Transportation exists to conquer space and time -”. Track Alignment. How is Alignment Measured in Tangent Track?. Track Alignment. How is Alignment Measured in Curved Track?

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CE 515 Railroad Engineering

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  1. CE 515 Railroad Engineering Track Source: Armstrong Ch 3, AREMA Ch. 3, REES Module 2 “Transportation exists to conquer space and time -”

  2. Track Alignment • How is Alignment Measured in Tangent Track?

  3. Track Alignment • How is Alignment Measured in Curved Track? • Mid-Ordinate Offset (in)=Degree of Curvature

  4. Horizontal Curve Elements

  5. Horizontal Curve Elements http://zierke.com/shasta_route/picpages/atsf120williamsjct.html

  6. Horizontal Curve Elements http://thomascranelibrary.org/jpg/legacy/fig50.jpg

  7. Gage • Measuring Gage

  8. Gage • Max Gage allowance 1-3/4” wider • Class 4 Operation, 1” max http://img.photobucket.com/albums/v329/Trainman-2/SCRM%20West%20End/IMGP4575.jpg

  9. Turnouts • 3 Groups of Turnouts • Lateral Turnouts • Equilateral Turnouts • Lap Turnouts http://s145079212.onlinehome.us/rr/howto/faq/faq_turnouts.htm#lapturnout

  10. Turnouts Bingmaps.com

  11. Turnout Terminology • Also See AREMA pp. 89-90 Fig 3-13 from Armstrong

  12. The Switch • Device deflecting wheels of train from track they are running • Switch is portion of turnout from Point of Switch (PS) to Heel of Switch (HS) • Video (model): http://www.youtube.com/watch?v=FF8YIH160hA

  13. The Switching Mechanism • Hand operated (switch stand) • Power operated (machine)

  14. Frog • Permits flange of wheel to cross the other rail http://static.panoramio.com/photos/original/6940512.jpg

  15. Frog Types • Rail Bound Manganese (RBM) • Spring Frog • Solid Manganese Self-guarded Frog • Bolted Rigid Frogs • Movable Point Frogs

  16. Guard Rails

  17. Railway Crossovers and Crossings • Crossovers can be considered as two turnouts • Crossing consists of 4 frogs (2 intersecting tracks)

  18. Railway Crossovers and Crossings • Slip Switch: combination of small angle crossing with pair of connecting tracks within limits of crossing

  19. Railway Crossovers and Crossings • Information needed to design crossings • See AREMA pp. 105-6 • Specialty manufactures design these features • Train Crossing Frog: http://www.youtube.com/watch?v=jeWxWkTlsUE • How they work: http://video.google.com/videoplay?docid=2853660703765713140&ei=xnFeS-28K5jqqwKsyI3oCg&q=Railroad+Frog&hl=en&client=firefox-a#

  20. Highway Crossings • Renewal of Crossings are Expensive • Public Safety is Serious Concern

  21. Highway Crossings

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