Here's a link to a good video featuring Amtrak locomotive 156 on the point of the Pacific Railroad Society Special. PRS ran a special excursion, April 1-2, 2011, between Los Angeles and Bakersfield via Cajon Pass and Tehachapi. Amtrak Heritage Unit "Pointless Arrow" AMTK 156 led the train.
Posted to YouTube by cchan006 On April 11, 2011: http://bit.ly/1uJtn8u