About July 1993, Espee had taken the eastbound #2 track out of service. All trains were being routed over the #1 track between Switch 9 and Shed 10. This was very slow for eastbound trains because the original x-overs were 10 or 15 mph. Eastbound trains crawled when negotiating the x-overs.

The eastbound #2 track was lifted between Switch 9 and the I-80 overpass at Yuba Pass. Both tracks remained in place between the tunnels and Shed 10 during the Winter of 1993. During the Spring and Summer of 1994, Espee made several improvements to speed up train traffic. First, they installed a longer turnout in both Shed 10 and Switch 9. Secondly, they made several realignments. Their is a transition from the #2 track bridge to the #1 track. The track swings back to the #2 track for tunnel #37. It uses the #2 track for tunnels #36 and #35. Just east of the new UP installed signal bridge at Yuba Pass, it transitions back to the #1 track all the way to Switch 9.

I have video of the first train (Amtrak #5) to use the transition alignment at Yuba Pass.