gs
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Your thinking of speed matching; profiling is where you build a throttle setting/scale_speed table to driver trains at a scale speed, calculate stopping distances, consist with a softthrottle, display on a JMRI throttle and other uses.
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At the fastest throttle setting it should be in block for 3 seconds at least.
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In N scale, if profiling a HST125 at a speed of 200kph you need about a metre, profiling a gp7 at 65mph you need about 2 feet.
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The most import thing is ensuring that the sensor reporting delay is the same for all sensors involved (excluding any JMRI debounce values.
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Turn off momentum.
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Steve G.
