A Certain Iron Railway Bridge

A Certain Iron Railway Bridge is a notable landmark of Academy City in the Toaru Majutsu no Index series that can be found in the School District 7.

Background
Located in the Seventh School District, this iron bridge is the first major Academy City landmark in Toaru Majutsu no Index. The bridge spans over a river, with a length of around 150 meters.

There is a railway line that runs on the riverbank beneath this bridge, and some cargo seems to be stored in the area.

Index Arc
On July 19th, fleeing from a large group of delinquents after seeing some of them harassing Misaka Mikoto and interfering in an attempt to save them from her wrath (revealed in the Level Upper Arc to be a misunderstanding, as Mikoto was actually attempting to gather information on the Level Upper from them) only to find there were too many for him to handle, Touma ended up on the bridge, where Mikoto caught up to him after taking care of the delinquents. During the subsequent clash, Mikoto called down huge lightning strikes, rendering more than 80% of the city's electric appliances inert.

Sisters Arc
Misaka 9982 ran to the area beneath this bridge during the 9982nd Level 6 Shift experiment in order to lead Accelerator towards one of the mines she planted. During the conclusion of the 9982nd Level 6 Shift experiment, Mikoto fought and failed to defeat Accelerator in the area beneath this bridge.

This bridge was where Kamijou Touma found Misaka Mikoto after she attempted to manipulate the data from the Tree Diagram information reception center. Touma stopped Mikoto from heading to her on this bridge, and took on Mikoto's lightning attacks before heading off to fight Accelerator.

Academy City Invasion Arc
Accelerator lied to Kamijou Touma when they talked over the phone, and told the latter to head to this bridge to meet Last Order. Touma hurried to this bridge and met Vento of the Front for the second time, witnessing the completion of the Imaginary Number District's expansion from here.

Homecoming Arc
Misaka Mikoto called Kamijou Touma to this location in order to give back the Gekota strap that Touma lost in the Arctic ocean.

Dream Ranker Arc
When Mikoto blasts the first gas tank that the Doppelganger raised with iron sand bullet, the iron bridge is briefly shown.

Toaru Majutsu no Index PSP game
The railway bridge is one of the possible stages in the game. Also, this is where the player will meet Sasha Kreutzev, as well as Accelerator and Last Order in the unlockable Misaka Mikoto route.