Another option would be to use "Beep" locomotives which have built in speed limiters. It doesn't matter where the kids push the throttle to, a "Beep" will not exceed 35 scale MPH. I've also pulled the boards from some worn out Beeps and installed them in old Lionel starter set 4-4-2 locos and gotten the same speed limiting. Which was good for my grandkids when they were younger.
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