Greater Manchester still has an extensive citywide rail network compared with other British cities with over 200 tram and train stations - much of which dates from the Industrial Revolution. Two mainline termini (Piccadilly and Victoria) and four through mainline railway stations in the central area (Deansgate, Oxford Road, Salford Central and Salford Crescent) form the Manchester station group. Ultimately, Manchester sits at a rail bottleneck, and it is hoped investment in the proposed Northern Hub from 2013 to 2019 by Network Rail will alleviate this.