Bill,
That depends on the type of engine, the number of modifications desired (TMCC, RailSounds, LED’s, electro-couplers, can motor, etc.), and the condition of the engine to begin with (i.e. will it require repairs before conversion work can begin). I gladly provide estimates. Please email me at precisionflyerrepairs@gmail.com so we can discuss what you want done. Thanks. I charge $30.00/hour plus parts and shipping at my cost.
Dave