Steam engines are definitely opposite. The smaller the driver size, the better tractive effort and traction the locomotive will produce. That's why switchers and low speed pullers have the smallest wheels.
The wheels on the foreign locomotive appeared much bigger than typical. I assume much larger than 44-inches. Maybe I am wrong.I haven't really done any diggin on theory but here is what I found when I surveyed wheel sizes.
I know there are some models I forgot but I needed road numbers to look them up and I was using numbers out of my head.
The wheels on the foreign locomotive appeared much bigger than typical. I assume much larger then 44-inches.
Not a good description. Number of wheels is determined by axle load (how many wheels it takes to spread the locomotive's weight) and tractive effort/adhesion limits (a higher tractive effort locomotive needs more weight on drivers to not slip). The formula for steam tractive effort depends on cylinder dimensions, steam pressure and driver diameter. The number of axles doesn't figure into it. A larger wheel is like a long lever arm: it allows the end (the wheel rim) to turn faster but with less force.smaller wheels mean you can have more of them, and more smaller wheels simply have that many more places to touch the rails. The biggest and smallest wheels each only touch the rail in one single small spot. More wheels means more spots.
I may have seen it in my Facebook page and was not able to copy it and paste it. It may have been in Indonesia in Indonesian language. Maybe it was electric but I would have thoughthat I would have noticed electric or diesel.... Do you remember where the locomotive was from? Any other details about it? Specifically, was it a very old rather than new locomotive? Many old electrics had large wheels; there weren't many diesels made in that era, but I can think of one or two.
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