I use code 250 - but just bought my first MTH unit (a V1000) so will let you know when it arrives. Code 250 looks A LOT BETTER than the heavier stuff (code 322).
Question about details on the F7 units - does anyone know which ones are without dynamic brakes or steam generator, but have dual headlights and streamlined (passenger) pilots? I can't really tell from the MTH web site.
Pete Jobusch