The Mount Washington Cog Railway has continued to thrill passengers from all over the world with its dramatic ascent to the summit of the highest peak in the Northeast, for over 150 years. The Cog is the first mountain-climbing cog railway in the world. With an average grade of 25% (some sections approach nearly 38%), it’s also the second steepest! Motive power is primarily provided by a fleet of seven powerful biodiesel locomotives, each custom designed, built and maintained on site. And with a nod to its steam heritage, the railway also continues to operate a pair of coal-fired steam engines in the warmer months, both well over a century old.