<Li> Also used by EMU motormen to warn passengers on a crowded platform of the approach of a fast train which will not stop at that station </Li> <P> UK diesel and electric locomotives are usually fitted with two - tone horns, sounded sequentially to distinguish them from the horns used on road vehicles, and, in the past, both tones were routinely used . However, because of noise complaints, new rules were introduced in 2007: </P> <Ol> <Li> The introduction of a night time quiet period, between 2300 and 0700 when trains will no longer routinely sound their horns at whistle boards (they will always sound their horns when people are seen on the track) </Li> <Li> That where the technology is available, drivers should only use the low tone from the two tone horn at whistle boards . </Li> <Li> For all new or replacement train horns on trains capable of travelling up to 160 km / ha much lower minimum sound pressure level has been established--and a maximum sound level has been introduced (min 101 dB and max 106 dB) </Li> </Ol> <Li> The introduction of a night time quiet period, between 2300 and 0700 when trains will no longer routinely sound their horns at whistle boards (they will always sound their horns when people are seen on the track) </Li>

What is the db of a train horn