The post-war history of Neasden is one of steady decline; local traffic congestion problems necessitated the building of an underpass on the North Circular Road that effectively cut Neasden in half and had a disastrous effect on the shopping centre by making pedestrian access to it difficult. The decline in industry through the 1970s also contributed to the area's decline. But nonetheless Neasden has survived, largely due to a succession of vibrant immigrant communities keeping the local economy afloat. Neasden Depot continues to be the main storage and maintenance depot for the London Underground's Metropolitan line (and is also used by trains of the Jubilee line); it is London Underground's largest depot and as such it is a major local employer.