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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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Presentation on theme: "CE 515 Railroad Engineering Track Source: Armstrong Ch 3, AREMA Ch. 3, REES Module 2 “Transportation exists to conquer space and time -”"— Presentation transcript:

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

6 Horizontal Curve Elements

7 Gage Measuring Gage

8 Gage Max Gage allowance 1-3/4” wider Class 4 Operation, 1” max

9 Turnouts 3 Groups of Turnouts – Lateral Turnouts – Equilateral Turnouts – Lap Turnouts

10 Turnouts Bingmaps.com

11 Turnout Terminology Also See AREMA pp 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):

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

14 Frog Permits flange of wheel to cross the other rail

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 Specialty manufactures design these features Train Crossing Frog: How they work: 28K5jqqwKsyI3oCg&q=Railroad+Frog&hl=en&client=firefox-a# 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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