File: nps_amtrak_620.jpg

File name: nps_amtrak_620.jpg

Original Resolution (pixels): 620 × 413

File Size: 245 KB (MIME Type: image/jpeg)

Date Published: October 23, 2019

 View image full size

 Download file

Image caption

Thanks to low friction between train wheels and tracks, and level train tracks with gradual turns, trains have high energy efficiency. Photo from National Park Service Amtrak Trails and Rails.