 Shoeburyness end of the trains) would be made into a "Quiet Zone", where the use of mobile phones and personal audio players is prohibited.The "Quiet Zone" was introduced in early 2008 and is indicated by magenta and white stickers on the outside of the carriage doors and within the carriage.A trial was carried out to install special film onto the windows of the Quiet Zone carriages to block all mobile phone and Wi-Fi signals.