Whittier Tunnel, Alaska.
This video is about motorcycling through the 2.5 mile long Whittier Tunnel in south-central Alaska. It is a long video (intentionally) because the section where you ride through the tunnel was left unedited. I did this so you could get a real experience on how long you need to keep focused on riding the narrow space between the rails, and understand there is no real space to pull over unless of an extreme emergency.
Whittier is located at 60°46′27″N 148°40′40″W (60.774174, −148.677649). The only land access is through the Anton Anderson Memorial Tunnel, a mixed-use road and rail tunnel.
Whittier is on the northeast shore of the Kenai Peninsula, at the head of Passage Canal, on the west side of Prince William Sound. Whittier is 75 mi (121 km) southeast of Anchorage.
The Anton Anderson Memorial Tunnel (often referred to simply as the Whittier Tunnel) is a multi-use highway and railroad tunnel that passes under Maynard Mountain. At 13,300 ft (4,100 m), it is the second-longest highway tunnel and longest combined rail and highway tunnel in North America. The tunnel provides access to the State of Alaska ferry terminal in Whittier, opening up possibilities to load your motorcycle on several ferry's and travel across Prince William Sound.
(Some of this information was taken from wikipedia)