 The 4-4-0 wheel arrangement, with its three-point suspension, was noted for its good tracking ability, while the flangeless middle wheels allowed the locomotive to round tight curves.Placing the fuel and water over the truck rather than the driving wheels meant the locos had a constant adhesive weight, something other forms of tank locomotive did not.Large numbers of Forney locos were built for the surface and elevated commuter railroads that were built in cities such as New York, Chicago and Boston.