HistoryEditThe Leslie "Supertyfon" S5T is a type of airhorn or trainhorn commonly found and used on diesel locomotives. The horn was produced by Leslie Engineering, and was produced from the 1950's to the 1990's. Many U.S Class 1 railroads used the Leslie S5T horn, and like the Nathan K5LA, it caused many sound problems involving people in near-by homes.
The Leslie S5T was once a commonly used horn on U.S Class 1 railroads, but it has become very rare.
Like the Nathan K5LA, there are many different variants in which the "bells" on the horn set are arranged. Such as: the S5TRRO, RS5T, and S5D.
Several Australian railroads have actually used the S5T on some of their locomotives.
Very few small Canadian Shortlines (Class 2 and 3 railroads) have used the S5T on some of their locomotives as well.
When the S5T was first introduced in 1953, the earliest S5T's sounded similar to a Nathan M5.
http://www.youtube.com/watch?v=JUvT1wvZVZ4&feature=fvst YouTube Video sound example
http://atsf.railfan.net/airhorns/s5t.html History examples
https://www.youtube.com/watch?v=g5qKeGV3CTo (Early S5T)