My friend and I went out to Jacumba yesterday to ride the unofficially abandoned Carrizo Gorge railway. Here are some pictures and video from the ride. The total 17 mile ride took about three hours, because of all the picture taking and scenic views.
Got to ride on some pretty gnarly train tunnels. Some really, really long
Picture while riding in the dark tunnel.
Some abandoned train cars in the background
The Goat Canyon Trestle. 750 feet long, 200 feet high. Second biggest wooden, curved trestle in the US.
Some history on the Gorge
San Diego & Arizona Railway History