The Mount Washington Cog Railway is the world's first mountain-climbing cog railway (called a rack-and-pinion railway).
The railway is still in operation, climbing Mount Washington in New Hampshire.
It is the second steepest rack railway in the world with an average grade of over 25% and a maximum grade of 37.41%. The railway is approximately 3 miles long and ascends Mt. Washington's western slope beginning at an elevation of approximately 2,700 feet above sea level and ending just short of the mountain's summit peak of 6,288 feet. The train ascends the mountain at 2.8 miles per hour and descends at 4.6 mph.
Gram and Pops visited here with their family in August 1983 and again with grandson Stewart in July 2017.
Click here for pictures of Gram and Pops' Trips