I recently purchased an Intermountain SD40-2 with ESU LokSound. I tried running it for the first time and found that it would not move. The sound/lights works and responds to DCC commands, and the prime mover rev sound increases with increasing speed steps. However, the locomotive itself does not move. When I try to boost it along the track it also does not move. Has anyone else had this issue before and have tips for solving it? Edit: I also found this line in Spookshow's review of the model: "For whatever reason, sound-equipped models tend to be a bit finicky when it comes to dirty wheels and track. So, an hour or two of roundy-rounding is the general rule of the day when it comes to wearing all the wheel blackening crud off the wheel surfaces (followed up by track cleaning, since that's generally where the crud winds up once it leaves the wheels). Additionally, it may be necessary to clean excess lubrication off of the truck contacts and wipers." Could this be related to what I am observing? I am just surprised there is literally no movement.