I too am using DigiTrax DZ123 / DZ125
These are a good compromise between size and functionality
As above, there are no issues with burning out of motors whilst they are sat on "live track"
However, make sure that the power settings are returned to zero when the loco comes to a stop (and not a very low speed setting that results in no movement, such as 1 or 2)
I have had one 3 pole motor converted and as this model is just as good as any other 5 pole motor
However, it was very good under DC, it was more of an experiment to see if it was possible
Equally, I have some 5 pole motors that perform poorly in comparison
The trick is to replace worn parts whilst stripping the models down as part of the conversion
Therefore buy some replacement brushes, refit them irrespective
Ironically, some of these older models run better than some of the latest (BachFar) DCC ready versions, which annoys me greatly
These are a good compromise between size and functionality
As above, there are no issues with burning out of motors whilst they are sat on "live track"
However, make sure that the power settings are returned to zero when the loco comes to a stop (and not a very low speed setting that results in no movement, such as 1 or 2)
I have had one 3 pole motor converted and as this model is just as good as any other 5 pole motor
However, it was very good under DC, it was more of an experiment to see if it was possible
Equally, I have some 5 pole motors that perform poorly in comparison
The trick is to replace worn parts whilst stripping the models down as part of the conversion
Therefore buy some replacement brushes, refit them irrespective
Ironically, some of these older models run better than some of the latest (BachFar) DCC ready versions, which annoys me greatly