Interlock system

Arla Foods has installed Castell's interlocking system, Salvo, on 16 loading bays at its state-of-the-art dairy in Leeds.

Shunters reverse their trailer up to the relevant loading bay, collect a Salvo Susie lock from a storage box and fit it to the trailer's emergency air line coupling.With the trailer now immobilised, the shunter takes the key released from the end of the Susie and inserts it into the Salvo control panel inside the warehouse. Turning the key switches on internal beacons and allows the bay door to be raised.

The key remains trapped in the control panel while the door is open.

Once loading or unloading is complete, the sequence is reversed.