One of the Astro variants designed for small industries, intermodal terminals and trucking yards was the Astra Yard Tow. Shorter than the standard Astro tractor, the Yard Tow can maneuver in tight spaces and is used to move equipment short distances within port terminals. They also spot container chassis pierside for container ship cranes and thence to dispatch where over the road tractors take over.
The Yard Tow is also built as a Hi-Railer, capable of driving on the road with a trailer, or with its small bogeys extended, it can move railway cars on small sidings where the cost of a heavy switcher is prohibitive.
One of GEAR 1's most successful private rail services companies, IGTCo./RAILPOOL, operates a small fleet of Hi-Railers which are contracted out to small industrial sidings and large ports alike, allowing businesses to move their freight without large overheads. The Hi-Railers can provide emergency power to reefer trailers or reefer railcars while being spotted, to protect the value of perishable cargoes.
I have included the RAILPOOL Class 70 PPS Railway Switcher. A PPS (Power, Pump & Service) switcher has an auxiliary generator and pumping equipment to help service passenger cars in railyards, provide temporary power, and spot consists of railcars in small yards and sidings where equipment service is limited. Class 70 PPS switchers with their microfusion powerplants have also been used to give emergency electricity to warehouses when municipal supply is disrupted, and RAILPOOL often donates PPS units to power affected residential neighborhoods during storms, as long as they can reach a siding and run cabling to the power grid.