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You can adjust the speed settings in the decoder. The simple way is using three CVs as follows:

Adjust CV2 in each loco until it is just moving at the lowest speed setting.
Adjust CV5 in each loco until all locos move at the same speed at the highest speed setting.
Adjust CV6 in each loco until all locos move at the same speed at the half-way speed setting.

If this does not match the speeds accurately enough, then you could try using the 'speed table' as described in your decoder manual, but this is quite complicated. However some motors may run at slightly different speeds in different directions or when they are warm or cold, so an exact match many not be possible.
 

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I was thinking it was worth checking Vmin first, partly because if the controller only has 14 steps it would be a shame if several of them do not result in any movement at all!
 
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