I've never seen or heard of one. The closest thing I know of is the Fastrack Railer. I've always wondered who the target audience for this piece is.
I bought one of these years ago when I first got into this gauge and bought some FasTrack. It is now well worn and used. Make sit easy for kids to put cars on the track, and it even works with Atlas track. I always pull it out if I'm putting more then one or two cars on the track. It just makes it that much faster.