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What you want is BEMF. This is the way to go for slow speed operation. It is a feature of many decoders in DCC. What it does is check the rotation of the motor and adjust the voltage supplied to keep it at a constant speed. Many people think that its use for controlling speed on hills. While that is one use, to me its main advantage is in making locos creep reliably. Any DCC system will be able to offer this. Once you experience it ,you will never go back. I can make a Proto 2-8-8-2 creep so slow with BEMFthat you have to look twice to make sure its moving.
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