Slide 1

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

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Track Alignment How is Alignment Measured in Tangent Track?

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

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Horizontal Curve Elements

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http://zierke.com/shasta_route/picpages/atsf120williamsjct.html

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

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Gage Measuring Gage

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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

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

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Turnouts Bingmaps.com

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

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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 http://www.youtube.com/watch?v=FF8YIH160hA

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The Switching Mechanism Hand operated (switch stand) Power operated (machine)

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

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

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Guard Rails

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

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

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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 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# http://video.google.com/videoplay?docid=2853660703765713140&ei=xnFeS- 28K5jqqwKsyI3oCg&q=Railroad+Frog&hl=en&client=firefox-a#

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Highway Crossings Renewal of Crossings are Expensive Public Safety is Serious Concern

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Highway Crossings