Many SATURN hoists can be configured for Dual-Rail operation. 

There are many reasons for using a Dual-Rail hoist including more STABILITY, REDUCED wheel loads and improved HEADROOM; for those hoists that are RAISED up between the two rails. 

Please see our photos below for some examples.

5-Ton, Single Hook Raised Dual-Rail Hoist

2-Ton, Single Hook Raised Dual Rail Hoist

Twin Hook Hoist with End Trucks for Dual Rail Operations