Railway Alignment Design and Geometry
[Pages:35]Railway Alignment Design and Geometry
Pasi Lautala, Michigan Tech University Tyler Dick, HDR, Inc.
Topics ?Horizontal and Vertical geometry
?Clearances ?Turnout design ?Structures and loading
1
REES Module #6 - Railway Alignment Design and Geometry 1
Railroad vs. Highway ? Passenger Vehicles
Top speed (mph) Weight (tons) Power to weight ratio (hp/ton) Length (ft) # of passengers Propulsion method
Passenger Car 65+ 1.4 150
Light rail vehicle 65 53.5 9.3
15 5 Gasoline engine
2
92 (articulated) 160 Electric (or dieselelectric)
REES Module #6 - Railway Alignment Design and Geometry 2
Railroad vs. Highway ? Freight
Top speed (mph) Weight (tons) Power to weight ratio (hp/ton) Length (ft) # of power units # of trailing units Propulsion method
Semi-trailer Truck 55+ 40 12.5
Freight (Unit) Train 40+ 18,000 0.73
65 1 1 Diesel engine
3
7,000 1-4 Up to 125 Diesel-electric
REES Module #6 - Railway Alignment Design and Geometry 3
Horizontal Geometry ? Degree of Curve
? Arc (Roadway and LRT)
? Angle measured along the length of a section of curve subtended by a 100' arc
100'
? Chord (Railroad)
? Angle measured along the length of a section of curve subtended by a 100' chord
100'
D R
D R
D/360 = 100/2(pi)R ? 1-deg curve, R= 5729.58' ? 7-deg curve, R=818.51'
R = 50/sin(D/2) ? 1-deg curve, R=5729.65' ? 7-deg curve, R=819.02'
REES Module #6 - Railway Alignment Design and Geometry 4
Curve length difference
Watch out for LONG and SHARP curves
REES Module #6 - Railway Alignment Design and Geometry 5
Horizontal Geometry ? Curves
Criteria Typical values
Highway - Design speed
Freeway: - 60 mph, R=1,340, D=4.28 - 70 mph, R=2,050, D=2.79
Railroad
-Design speed -Allowable superelevation
Main lines: -High speed: R > 5,729, D2,865, D1,433, D764, D ................
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