Rio Grande In Color Volume 6: Tennessee Pass from Morning Sun Books is an all-color look at 1990s action on Tennessee Pass as the last Rio Grande locomotive-powered trains move traffic over the Continental Divide. The book covers every facet of operation needed to keep trains going on the pass′ 3-percent grade. It′s the last hurrah for the small yet mighty Rio Grande before it succumbed to industry mergers. Rio Grande In Color Volume 6 is one of several titles about the legendary Denver & Rio Grande Western. Hardcover, 128 pages.