I bought a NScale - Bachmann 80451 - Steam Engine - Baltimore & Ohio 7600

Connected it with a new controller "Railpower 1370"

Engine ran for few minutes and then smoke came out and it stopped running

The front and back lights still comes on

I suspect the motor is maybe fried ....

Any ideas, how to open this engine to take a look at the motor.

Appreciate any help ....

Best Regards,