Hi, refering to Neil’s thread, this is why goods loco’s have smaller wheels because you put more power into a shorter distance. I can remember when I was just a mini me we lived on top of our railway very close to the station and the kiddies playground is dead opposite the station, on occastions when a passenger train started off you would see the wheels slip. Despite theses loco’s being bigger and heavyer than the goods loco’s, I can’t ever remember a very long goods train doing this, in them days we had as many if not more goods trains as passenger trains, and they were always slower.
Steve, I believe the 9F’s have coparatively smaller wheels than most of the passenger loco’s of the same size, and were used for goods traffic for most of thier service.
Regards Nick.