ABSTRACT
Like all establishments which interface with the general public, DLR depends on good quality public address (PA) for communicating information. Initially DLR stations were generally equipped with a limited number of PA loudspeakers which broadcast messages right down each platform. Variation in volume level was restricted to two settings: daytime (normal level) and night time (reduced level). During the day, PA announcements were often drowned out by excessive background noise, e.g. other trains, traffic, aircraft. At night, the PA system was sometimes perceived as being intrusive by local residents when the railway was being used by only a few passengers waiting on the platforms.
