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[quote user="caldreamer"]Physics is physics no matter the size from 1:1 down to 1:110 z scale. These laws DO NOT change.[/quote] You are right, physics are he same and I said before, if it works for you it is OK for me. But that doesn't mean it is physically correct. First of all the tractive effort (TE) doesn't represent the weight of the train it can pull but it is a train's resistance it can overcome. Second, TE is dependend on weight on driver (W) and adhesion factor (Fa): TE = W * Fa; As scale weight is W/160³ for N-scale, physically TE scales down the same way to Scale TE = TE/160³. In reality it is even less than that as adhesion of our locomotives is less than of the prototype. Cause: Different materials, no wheel slip control. Power assignement doesn't have to be science, only believable and representing prototype practice. In our model world 4-axle and 6-axle locomotive weigh the same and pull the same compared to the real thing. Regards, Volker
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