Train to catch is the 12th mission of Crysis 2. For this walkthrough, players will clear out a number of alien entrenchments with the help of a group of marines, in order to secure the evacuation point for a group of stranded civilians. This mission is both short and easy.

1. Head towards the mission objective.
2. Shoot the 2 aliens in the barricade and continue on.
3. Watch the alien Gunship as advised.
4. Continue on to the new objective.
5. Clear out the alien holdout ahead. The K-volt gun is especially useful here due to how powerful it is.
6. Make sure to continue restocking ammo. There are a lot of ammo caches all around open area in front of the library.
7. Activate the two missile installations by following the objective to the right and then the left.
8. Head into the library.
9. Go up the stairs around the left.
10. Activate armor mode to get through the fire.
11. Activate armor once again to get through the second fire.
12. Head through the door on the left.
13. Continue on towards the objective, ignoring the black alien completely.
14. Clear out the evac sight.
15. Follow the marines to the new objective. 
16. Clear out the area from the highground point. Grenades are especially useful here to lodge from behind cover, as the aliens are close together.
17. Move towards the new objective.
18. Another group of aliens, along with 1 Tank alien will drop down. Take out the weaker aliens and then the Tank.
19. Continue on to the objective.
20. Take the grenade launcher inside the quarantined tent area. It's a very cool gun!
21. You will come into another open area with alien pods dropping down. Clear it out.
22. Go towards the objective and press F to activate the panel.
23. Get inside the armored car.