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Loco whistle/horn codes
Whistle or horn codes consists of long and short blasts on the engine whistle. Here is a list of whistle codes. Notation: We use the following symbols to denote different kinds of whistles. Note that many of these are now no longer in use. The long whistle to indicate a train about to leave a station, and the short whistles to indicate light loco movements are the most common ones still in general use.
'o' : denotes a short blast on the horn.
'--' : denotes a comparatively long blast on the horn....