superelevation

noun
su·per·el·e·va·tion | \ ˌsü-pər-ˌe-lə-ˈvā-shən \

Definition of superelevation 

1 : the vertical distance between the heights of inner and outer edges of highway pavement or railroad rails

2 : additional elevation

First Known Use of superelevation

1840, in the meaning defined at sense 1

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The first known use of superelevation was in 1840

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