According to Whyte notation a steam locomotive that has a two-axle leading truck, two powered driving axles and a one-axle trailing truck is referred to as a 4-4-2 or "Atlantic". Atlantics, while not well-fitted for mountain runs or long distances, were perfect for short runs at 70 -100mph due to the large diameter driving wheels the possessed.
Built for passenger service, many railroads employed the use of this type of steam locomotive for express, commute and local service. One of the most well-known fleets of 4-4-2s were those in the service of the Pennsylvania Railroad, who had many in operation on their rail lines.
