Date: 04/02/2020

The Highland main line (HML) between Inverness and Perth is the most severely graded line on the UK railway network. It requires southbound trains leaving Inverness at sea level to climb 1,315 feet in 22 miles to reach the Slochd summit a maximum gradient of 1 in 60. After this, the line drops to 800 feet to go through the Upper Spey valley, overlooked by the Cairngorm mountain range. The line then climbs to the Druimuachdar summit (1,484 feet), the highest point on the UK network. Northbound trains climbing this summit face an 18-mile climb at a near constant 1 in 70 gradient.

External links

Azumas HIGHEST challenge

Rail Engineer

The Highland main line (HML) between Inverness and Perth is the most severely graded line on the UK railway network. It requires southbound trains leaving Inver