Here are some of the details on my 1963 Gulf, Mobile & Ohio Leslie Supertyfon S5T-RR. This horn has an exact, custom color match to Illinois Central Railroad orange. It also has marks on the bells, power chambers, and manifold that show what goes where and which direction the bell is suppose to face, according to GM&O practice. Although the horn is shown in a 31/55 reversal, it was actually a 25 bell reversal in service. Credit for pictures and audio go to Phil Casteel.