Is your Pullman a full length car. or a "shorty". Athearn, MDC, Con Cor, and others have made passenger cars that scale out to 72 feet instead of 85 feet in order to go around 18 inch radius curves. Con Cor also makes full length 85 foot cars as do Rivarossi, Walthers, and anything brass. If you are running full length cars, you will need to run at least a 24 inch radius and I suspect it will need to be closer to 30 inch radius. If you have a radius that big you can run anything. For passenger steam, a 4-6-2 pacific, or 4-8-4 Northern would be good. 4-8-2 Mountains were also used in passenger service. I think the U.P. used the 4-6-6-4 Challengers for passenger service. For diesels, any EMD E unit or F unit could be used as well as Alco Pa's or DL109's some roads ran EMD gp7's or 9's or Alco Rs units with steam generators for passenger service . If you run the shorty cars to enable you to run on 18 inch radius, you will be better off running a pacific in steam or a f-unit in diesel, or something with 2 axle trucks. I think atlantic type 4-4-2 were used in passenger service where the railroad was flat, but a 4-4-2 would not have the power to pull more than 1 or 2 passenger cars up any sort of grade.
