From the town of Ash Hill, named after Southern Pacific surveyor Benjamin Ash, (location of this note) through the railroad curve at Klondike, and to where both tracks rejoin down south at the old AT&SF water stop of Siberia, (not Russia), there is a second track being built through the railroad curve.
Watch this, link, https://youtu.be/bIP-FJYDl2Y?t=626