Ichigo Kurosaki

You'll have to shoot 'n' scoot through three sections of tunnel. Be careful: there's a civilian at the beginning on the opposite side and one in front of the abandoned train station. At the old station, you'll have lots of spider bots to deal with. Near the back wall, is a hot dog cart. The wall on the right can be blasted. When you do, more spider bots will pour through. Make a hole big enough to walk through and go up the stairs. Go through the two doors. End of chapter. Next chapter is an active station. Plenty of armed guards and civilians, so watch where you shoot. There are also a number of flying gunbots. You have to make your way to the other platform by passing through one of three sets of doors into a long corridor and then a series of doors on the other side of the corridor. When you reach that side, you'll have at least two guards and two flying gunbots. Then head down the open tunnel. End of chapter.
Keep going through the tunnel. Eventually Quill will comm you about being on the other end of the bridge. Lots of soldiers drop down from holes in the roof. You'll have to kill quite a few to end the attacks. Reach Quill. She'll tell you how to blow the bridge. Blow the bridge. End of chapter.