I like the Texas Chief that ran between Houston and Chicago for 2-3 years only,
1971-1973 or so. I like the Yellow Bonnet. Amtrak bought out Santa Fe and ran that route with the Yellow Bonnet until 1973 when Santa Fe made them get rid of the Yellow Bonnet scheme.
(side bar) bought a MTH texas chief and on the box they tell of the history of the "super chief that ran between Chicago and California. The Texas chief never went to California and the super chief was the red bonnet. I sent off an email to MTH to tell their history department to get their story straight. never got a response.
Popi, the two actual yellow engines in passenger service -- 304L and 315L -- ran on all three transcontinental trains which ran over the Santa Fe in the early days of Amtrak, the Super Chief, Texas Chief, and, for one summer, the Chief. I cannot say for sure, but they could have also made some San Diegan trips. They were not assigned exclusively to a train.