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Southern had many steam-generator-equipped F3s and also had heater cars (some converted FT B-units) to use behind freight units. I have a photo of an FT with a (non-FT B unit) heater car behind it, and photos of a varied consist with an FTb heater car. Southern also had FP7s. Nashville, Chattanooga and St. Louis also used steam-generator equipped F3s. Fs weighed around 240,000 pounds, all on drivers. Es weighed around 350,000 pounds with about the same weight on drivers as the Fs. Santa Fe probably used passenger Fs in higher-speed service than anybody else, but probably had to pay close attention to the taper in the wheel treads to keep the trucks from "hunting" at high speeds. I've seen Blombergs hunt at 70 MPH under passenger GP9s, an uncomfortable situation. It was possible to use non-tapered (cylindrical) wheel tread configurations to minimize the hunting problem. Old Timer
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