“Madame Queen” the diesel-devotees called her - or the “Queen Mary,” she was SF-1, under her original EMD (General Motors) serial number 744 of December 1937. She was 1800 horsepower, and a second A cab-unit plus one B centre-unit were ordered - for the new 17 car streamliner, City of San Francisco. This famed diesel-electric locomotive stands not far away from another notable Southern Pacific engine class in August of 1949 in Ogden, Utah. She was aging then - carrying still the number 6011, and her pleasing port-holes along her sides. The other engine beyond her was an MT-4 “Mountain-Type” steamer of repute, the 4356. The 4-8-2 wheel arrangement had long proven its worth on Southern Pacific rails. Photo by Guy L. Dunscomb/Southern Pacific Railroad Publicity Department and my collection.