Thousands of people whose lives have been blighted by noisy train horns have been offered respite by Network Rail. 70 MPs from all parties signed a Commons motion demanding action against train horns (links below.)
http://www.rmtbristol.org.uk/2007/04/mps_campaign_silences_train_ho.html#more

http://www.rmtbristol.org.uk/2007/04/rmt_warns_of_lineside_lottery.html#more

The company has finally bowed to pressure from MPs and imposed new rules on drivers.

They have been told that they should no longer sound their train horns as a matter of routine between 11pm and 7am when approaching the nation's 2,800 footpath crossings.