ConducTTor wrote: However, at 0 throttle the locomotives' lights are on and also there is a strange humming / buzzing coming from the motors. When the throttle is increased they moved as expected. Is this normal for analog locos on a DCC line?
Yes. DCC applies an AC waveform to the tracks. The humming you hear is the motor moving back and forth very quickly. To run the locomotives, address 0 actually applies a DC offset to the waveform to get the motor to spin. You will find that all the lights will be on at the same time, which is also normal. It is advisable that you not leave your non chipped locomotives on DCC powered tracks if not in use.