I live quite near the DART line southside and I've noticed a wake up blast from a DMU of some sort before 5:30am every morning. It's a little annoying to say the least.
The DART horns are a lot less disturbing than the fog horns that IE seem to use on their diesel trains.
IE trains generally seem to have a US-style "Wake the dead" air horn on the front. At least in the UK trains seem to have the option of a "dooo dooo" type noise to alert people it's on its way.
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