A summer tradition in New England is getting a new, clean power source. This story from New Hampshire Public Radio says Mount Washington’s Cog Railway has a new biodiesel engine to power the unique railway up the highest peak in the Northeast.

The popular tourist attraction is also rolling out a new biodiesel engine during the holiday weekend. The new engine is named Metallak, in honor of the last surviving member of the local Abenaki tribe.

Each 3-hour round trip on the Cog includes an hour spent at the summit, where passengers get free admission to the new summit weather presentation created by the Mount Washington Observatory — titled Extreme Mount Washington.

This is the 145th year for the railway.