This page provides a walkthrough for the second part of the eighth chapter of Uncharted: The Lost Legacy - "partners". This part consists entirely of encounters of numerous enemy forces at the train station. Your main objective is to shoot down the chopper circling above the station, which involves getting familiar with the area and planning all of the steps.
Railway station is a sprawling location and, before you start exploring it, you should realize several things. In this fight, unlike in the previous one in this chapter, it is possible to act from shadows, especially that this is HIGHLY recommended, because this may make your job easier. You can hide in water reservoirs (do not surface while swimming), tall vegetation, as well as various buildings, railway cars and other objects.
While exploring the area, you only have to watch out for the enemy mercenaries (especially avoid patrols of two soldiers and snipers), but also the chopper circling above the station. It will be your objective to shoot down the helicopter and destroying it will end this chapter (even if there will be soldiers remaining at the station).
The most helpful at destroying the helicopter will be RPGs that you can find in five locked orange crates (1/5-5/5) scattered around the station. You do not have to find them all, unless you want to find all the collectibles in the game. It is possible that you will miss the crate in the left part of the station (next to one of the tracks) and two crates in the right part of the station (on the be d of a truck and to the right of the bridge above the tracks).
It should be easy to find the remaining two. The first one is in the car shown in the above screenshot in the central part of the station, under the bridge occupied by one of the snipers. The easiest way to reach the crate is by jumping into the water in the starting point and sneaking through, hidden in tall vegetation.
The other one of the easier crates is next to a wall and a locked gate at the very end of the area and it has been shown in the above screenshot. The good news is that by default, there are no enemies here and you can open the crate without being bothered.
After you obtain, at least, two rockets, find a place where it will be difficult for the enemies at the station to lay fire on you after the alarm is raised. Wait for the chopper to fly by and fire towards it. Right after you have fired the first rocket, fire another one, because you can miss the target or die, as a result of an attack from both the chopper and the mercenaries.
After you have hit the helicopter twice, find an opportunity to grapple onto the vehicle (there is a hook on it). If you find it difficult to do that from the ground, climb onto one of the railway cars, for example. As soon as you have done that, climb up quickly, because you will be fired at by the other enemies (you can make things easier for yourself and eliminate, at least, some of them still before you attack the chopper).
Continue up the rope, up to the side door of the chopper. Open it to start a fight with an elite Shoreline mercenary - Orca. While struggling with him, you will have to wait for opportunities to tap Square. After Nadine also makes it into the chopper, you will have to change the button and start tapping Triangle. The chopper will soon crash and you will watch a new cutscene and will progress to the last stage of the game.
Note - If, from the moment the last scene started (i.e. after you reach the train station), up until the moment you climb to the helicopter, you do not kill the minor opponents (reach crates with RPGs by sneaking and climb into the chopper right after you have hit it twice), you will receive a trophy - Right Under Your Nose.