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In depth idiot
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You can buy Gaugemaster controllers with complete confidence. It's a good brand with a track record of well made and reliable kit, and service back up in the event of any problems. (There are other brands, but having gone DCC I have rather taken my eye off the DC control ball.) The 'feedback' controller works by momentarily interrupting the power supply to the track and estimating the motor speed by measuring the 'Back ElectroMotive Force' (back EMF) which is the current the motor produces when operating as a generator. The power is then regulated using this back EMF value to keep speed reasonably constant. It cannot completely eliminate speed variation but if the loco has plenty in reserve then a satisfactory result can be obtained.
 
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