A route summit is the highest point on a transportation route crossing higher ground. The term is often used in describing railway routes, less often in road transportation. In canal terminology, the highest pound on a route is called the summit pound.
Examples of usage
Rail
Beattock SummitButt (1995), page 30 Stainmore Summit, formerly the second highest railway in England until its closure in 1962 Summit Tank - highest point Unanderra - Moss Vale Cullerin - highest point Sydney - Albury Shap
References