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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.

Grade Separations – Road over Rail • 23’ vertical clearance, plus future track raise • Allow for maintenance road and future second track • Collision protection for piers within 25’ of rail centerline • Do not drain roadway on to tracks! • Other details vary by specific railroad .

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