What did you do to your trains today?

[Super]

All the Tamiya motors I have used and seen run with 1.5 volts for these trains. If Bulgy uses the same size motor (measurement wise) then it should be swapped even up. One thing to note...Bulgy might me quite faster depending on which Tamiya motor is used. Since its for Bulgy maybe a motor out of an old Thomas may be a better speed for him.

Here is a comparison of speeds of a couple of Tamiya motors from a former member here