Portable Shot Blasters provide one-step surface preparation for a variety of concrete surface applications where a minimum amount of material must be removed in preparation for resurfacing. These are designed for surface preparation of horizontal surfaces such as concrete floors or steel decks.

Portable shunt is a tub-changing arrangement for a tunnel face. The double-track loop is superimposed on the tunnel track and equipped with ramps, clamps, and spring switches so arranged that the loaded cars take one track outward while the empties take the other track inward.