The train would unbuckle at Collinsville, and be pulled across the Delta by barge (requiring several trips), and then be rebuckled together on the other side at the foot of Railroad Avenue in Pittsburg, and resume its trip to San Francisco.
The train would detach at Collinsville, be towed across the Delta by barge (requiring multiple trips), and then reattach at the foot of Railroad Avenue in Pittsburg, restarting its journey to San Francisco.