The station has 17 platforms, numbered 1 to 17, and arranged in two groups. Platform 1, the northernmost platform. The station's main entrance is from St. John's Hill, into a foot tunnel which is 15 ft (4.6 m) wide. It runs under the eastern end of the 17 platforms, and to a northern exit, which has restricted opening hours. The foot tunnel becomes very crowded during the morning and evening rush hours, and ticket barriers at the end of the tunnel are a particular pinch point.