There is a great magazine article about the Oro Dam Railroad and construction in Issue #114 of Extra 2200 South. The article written by Kent Stephens was published by that magazine in 1997. The article states the dam topped out at 770 feet on October 5, 1967. The last construction train ran on October 6th. The eight remaining U25Cs left Oroville east bound on October 10, 1967 bound for the L&N.
There is no mention of any McCloud River units. Some WP units were used after the 1965 wreck and for a work trains both before and after to move equipment and build the line. Three Espee DRS6-6-1500s were put on standby by GE in case the U25Cs were not built in time for construction start up, but were rejected by Oro Dam Constructors. WP ALCO switchers were used on the construction trains.
Govenor Ronald Reagan dedicated Oro Dam on May 4, 1968.
Cotton Belt: Runs like a Blue Streak