What do you mean by a 'turnround' at each end? It seems that dc running on the decoder has not been set to off, and Maud is responding to a noise spike, either dirty track, wheels, or pickups, or a dodgy wire connection could cause this. If you power up the select, with Maud OFF the track, then put her on, does she immediately shoot off at speed? - The numbers displayed on the Select, on power up, are just telling you what update status the controller has installed. (Edited for typo's)