(PD) Photo: Schumacher Portraits John Diedrich Spreckels in 1901.
(PD) Image: San Diego Union The front page of the December 14, 1906 edition of the San Diego Union proclaims, "RAILROAD FROM SAN DIEGO TO YUMA IS NOW ASSURED."
(PD) Photo: John R. Signor Collection The boarding train at Valle Redondo, with wye to the right, January 1912.
(PD) Photo: Unknown An SDA survey party, August 1914.
(PD) Photo: Unknown Looking into the United States through Tunnel #4, 598 feet long.
(PD) Photo: Unknown SDA #25 and train have just emerged from Tunnel #16 westbound.