Hi, Steve.
I realize you specified the time frame through the 60s but I thought I'd chime in anyway. Burlington Northern ran some very colorful passenger consists following its creation in 1970. Taking it one step further, the New Jersey Department of Transportation purchased a group of former Great Northern cars from BN as part of its program to upgrade commuter services around the state. The BN cars wore several different BN/GN schemes at the time and, combined with existing CNJ equipment and second hand equipment purchased from other roads, the result was passenger trains which seemed to have every color of the spectrum. Here's a shot I took in 1979. The train pictured consists of former BN/GN cars wearing Sky Blue, Empire Builder, Cascade Green and NJDOT blue and silver.
Of course, once Amtrak was created and the company began to reassign equipment, you never knew what you'd see from train to the next. It was all quite colorful to say the least.
Bob
