If this is the Schwintek slide you're talking about it could be possible the motor has just popped straight up and not engaging with the gear to runs the slide in and out.
https://amzn.to/37mSfwt
On the shaft end of these motors you'll see the four screws/pins sticking out, these are what hold the motor from twisting when it is dropped all the way down into place and there's usually a screw from outside the coach to hold this motor down in place.
If that single screw were missing your motor might've popped up and its just not engaging the gear as intended.
If you do think it's a track problem though, I haven't been lucky enough to have to deal with that problem yet.
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