In the United Kingdom, a train hauled using two locomotives is known as a "double-headed" train. In Canada and the United States, it is quite common for a long freight train to be headed by three or more locomotives. A train with a locomotive attached at both ends is described as "top and tailed", this practice typically being used when there are no reversing facilities available. Where a second locomotive is attached temporarily to assist a train when ascending steep banks or gradients (or to provide braking power for a descent), this is referred to as "banking" in the UK. Many loaded trains in the US are assembled using one or more locomotives in the middle or at the rear of the train, which are then operated remotely from the lead cab. This is referred to as "DP" or "Distributed Power."