The factory tach tapes for MTH have 24 stripes. However, that's because they know what the gear ratio is. With non-MTH locomotives, the gear ratios can be all over the map. I've done some brass locomotives lately with much higher gear ratios, so 24 strips runs them way slower than the indicated scale MTH. If you reduce the stripe count, they'll run faster because the speed control is simply count stripes. If you increase the stripe count, they'll run slower. You can adjust a non-MTH locomotive to run at the indicated scale MPH by modifying the stripe count on the tach tape, that's why you'd go to the trouble.
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