Yosemite National Park today unveiled four new hybrid (electric/diesel) tractors that will be used to pull open-air trailers of visitors in popular Yosemite Valley Floor Tours.

Officials said the new tractors will reduce emissions by 85% and get eight times better mileage than the previous propane-powered vehicles,

The new tractors -- costing $150,000 apiece -- complement the park's fleet of 16 hybrid shuttle buses (also electric/diesel) used in Yosemite Valley and Wawona.

In case you've never been to Yosemite Valley, the photo, taken by Yosemite spokesman Erik Skindrud, gives you an idea of what they look like.

Approximately 70,000 Yosemite National Park visitors take the Yosemite Valley Floor Tour each year.