The classic Focus Dolly is a lightweight, portable suitcase-style dolly for track use.
 
It fits together in less than three minutes, and the design incorporates dual features. When closed down, the dolly becomes a portable flightcase, the push/pull handle functioning as the transport handle. The hard rubber wheels simply pop in the sockets of the dolly.
 
The trackwheels, which operate on both curved and straight track, are stored inside the dolly case for transportation.