The front or water end of each two-span bridge, see Figure, is carried on a portal pier equipped with bins for loading coal into hopper or gondola cars. The centre and rear end of the two-span bridges and the forward end of the single-span bridges are carried on shear legs, each running on a single line of rail. The rails are supported-on trestles constructed of steel girders carried on steel A frames. There is one single rail trestle or runway, and one double rail trestle.