Union Pacific's armour yellow is one of the most famous painting scheme in America. Its armour yellow has been used since 1930s, and never changed. Today, Union Pacific still preserved a lot of passenger fleets for bussiness use. It is not too difficult to see them running in the US. However, those 2 photos I show you are not owned by Union Pacific now. The right one is ex-Southern Pacific sleeper, and used in City of San Francisco. It was a joined train between Union Pacific and Southern Pacific, so it did paint like that way before. Union Pacific had many wellknown passenger trains. Most of them were named as City of XXXX, Such as City of Los Angeles, City of San Francisco ......etc.