By
LiseS
at 18:21 on 15/08/10

An investigation has been launched into the runaway engineering train that become uncoupled on the Northern Line on Friday morning and rolled for almost four miles before halting at Warren Street. London Underground and the Rail
Accident Investigation Bureau will be looking into the incident, which began at Archway station at around 5.25am on Friday when an engineering
train broke down and was attached an out-of-service Northern Line...