Intamin uses the differnt types of tracks for two reasons. The first one is that there is a high amount of stress put on the track. The other is that 4 rail track needs less supports than two rail track. Basicaly, if the track is high in the air, it would be cheaper to use 4 rail track and use less supports, while when the track is close to the ground, it is cheaper to place a support every 20 ft than make the 4 rail track.
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*** This post was edited by Mark B. on 7/13/2002. ***
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