Well we've had another UK Rulebook revision recently.
And it would seem that the Noise Abatement complainers have had their way again.
So now when passing a signal at danger (with authority) it is no longer required to sound a low tone on the horn/whistle before moving off.
You may remember that a few years ago they removed the requirement to sound the horn when entering & leaving tunnels, and before that they removed the necessity to sound the horn when passing a stationary train in a station.
At this rate they won't need to fit horns on the next generation of trains.
I suppose we could always email or twitter someone if we see them on the lineside !
