Cannot think of any loco motors that dont come with flywheels. Even the tiny Climax Lemon came with a flywheel. I guess if you are dcc a decoder will do a 100 times better than a flywheel in terms of cruise control of your loco. On the other hand a flywheel in the old days with a power pack or throttle with mommentum worked pretty good too!. Not everyone is DCC so i guess flywheels still added to motors..................quite surprised they are not deleting flywheels on DCC locos as cost cutting measure