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CE 515 Railroad Engineering

Learn how railroad alignment is measured in tangent and curved tracks, along with the essentials of turnouts and switch mechanisms in railroad engineering. Explore frog types, guard rails, and railway crossovers & crossings for efficient track design.

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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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