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Is the Power Functions Train Motor (set 88002) the right height for a gray-era train (set 7745)? Does the Power Functions Train Motor run OK on gray-era tracks?
As seen in this video, it is possible to add Power Functions to set 7745 and run the train on gray tracks
Lego Train 7745 with Power Functions
photo from Brickshelf gallery
Lego 7745 powerfunktion
Required, but never shown