First one whistle sounds, then another ... each Pi has a Cellular radio built-in. The whistles used in this installation aren’t old train whistles. They are brand new cast brass whistles ...

The TYFON train whistle itself originates from the 1920s and has been used for train signalling since the 1930s ... From Scandinavia to the Pacific, you will hear the unmistakable sound of TYFON . By ...