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Railway Alignment Design and Geometry

REES Module #6 - Railway Alignment Design and Geometry 1 1 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 REES Module #6 - Railway Alignment Design and Geometry 2 Railroad vs. Highway Passenger Vehicles Passenger Car Light rail vehicle Top speed (mph) 65+ 65 Weight (tons) Power to weight ratio (hp/ton) 150 Length (ft) 15 92 (articulated) # of passengers 5 160 Propulsion method Gasoline engine Electric (or diesel-electric) 2 REES Module #6 - Railway Alignment Design and Geometry 3 Railroad vs. Highway Freight Semi-trailer Truck Freight (Unit) Train Top speed (mph) 55+ 40+ Weight (tons) 40 18,000 Power to weight ratio (hp/ton) Length (ft) 65 7,000 # of power units 1 1-4 # of trailing units 1 Up to 125 Propulsion method Diesel engine Diesel-electric 3 REES Module #6 - Railway Alignment Design and Geometry 4 Horizontal Geometry Degree of Curve Arc (Roadway and LRT) Angle measured along the length of a section of curve subtended by a 100 arc D/360 = 100/2(pi)R 1-deg curve, R= 7-deg curve, R= Chord (Railroad) Angle measured along the length of a section of curve subtended by a 100 chord R = 50/sin(D/2) 1-deg curve, R= 7-deg curve, R= 100 R D 100 D R REES Module #6 - Railway Alignment Design and Geom

Angle C = Turnout angle . REES Module #6 - Railway Alignment Design and Geometry 21 Basic Plan Sheet for Track Design . Track Clearances • Specific clearances necessary for safe operations • Size of car clearance envelope is based on dimensions of: –Locomotives –Cars –Potential large loads

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