As a surveyor I'm surprised you don't know this...
The London and Northwestern Railway forms a straight line 180 miles long between London and Liverpool. The railroad’s highest point, midway at Birmingham station, is only 240 feet above sea-level. If the world were actually a globe, however, curveting 8 inches per mile squared, the 180 mile stretch of rail would form an arc with the center point at Birmingham raising a full 5,400 feet above London and Liverpool. Adding the station’s actual height (240 feet) to its theoretical inclination (5,400 feet) gives 5,640 feet as the rail’s necessary height on a globe-Earth, more than a thousand feet taller than Ben Nevis, the tallest mountain in Great Britain! ”
—David Wardlaw Scott, Terra Firma (1901)
Hahaha, your argument there is so stupid it’s funny. You can’t be that obtuse, can you?