Not much but armor and some ammo in this boiler room. Follow the path and hop at the end of the walkway. Go around the machinery and down a ladder, then slide along some debris to the next platform. Pick up the intel, then take cover behind the crates on the left as you fight four Replicas, who are very weak to headshots with no helmet; and also you can use the exploding barrels. Then go up and pick up an intel by the platform. Get on and press the button in the upper right corner.
*NOTE: I haven't said much about using melee for this game, but now may be a good time to use melee kicks to good effect.*
I say take shelter in the very back of this car, but there is no safe place on this tram. The second one pulls up to your left, and from there they can enter your car from all but the very back and the right of you. The assault rifle is the gun of choice, but either have the pulse or sniper ready for the quick swap out. I also say that once the other tram is over you, start setting up mines in spot such as the hall between this rear car and the front; or save them for when you board the front car, your call. It's just a test of your ability to survive when you don't have solid cover and the enemies do not stop pouring in. You really don't have time to aim, as you will constantly need to reposition yourself.
*NOTE: Remember, you have four types of grenades. Use them in any order, but I say hold the mines for when you board the front car.*
Once the second tram goes above you you need to be ready for rappellers and more from the front. It was now that I switched to the sniper rifle, but you could use a pulse shot now when you are swarmed. When you hear that the rear car is in danger, run through the hall and press the use button to get on the front car.
Now things get interesting as the enemies can only enter from the back, so now is a good time to set mines all along the back of this car. These are just the Replicas with no helmets, so aim for the heads and don't let them swarm you - it would be very easy with a pulse shot or a shotgun, but the ASP will do. Then the fighting is over. When you hear the repeated warnings, get near the control panel and when the objective is to use it, use it; though oddly I did die when I first used it, not sure why.
Get down on either side, approach the guy once, then again using either ladder. Around the corner up here is an intel, and then go up the ladder through the doorway. Just one lone assassin to kill. Move along and take a ladder to your right for an intel. Cross the walkway to make him disappear again. Continuing down this hall is the correct path, but if you need a med kit and some light ammo you can take a vent to the left all the way around to above where you picked up the intel, but then you'll need to kill an assassin, and if you do you can crawl on the pipe to get back on the path.
Go up the ladder for grenades, pulse ammo, and an intel nearby. In the next big room you are free to follow him. Go down one level and look to the left for a ladder to climb down to pick up another intel. Back up and look to the front of the platform, which is at the bottom of the ramp, you can use the panel to lower the platform, then run up the ramp and across to the other side. Grab the laser if you ASP is low on ammo, because when you get on the platform and try to cross, three assassins will drop on. A mine may help, but all you can do is fall back and use slo-mo, hopefully cutting it off so you'll have enough for all three. Three pulse rounds may not be a waste if used on them.
*NOTE: The laser is actually okay on these assassins, makes short work of them.*
There is a fourth, and he popped up when I was looking over the end of the platform, so be ready for that. Hop off onto the walkway and go right after you kill him. Use the ladders to get a reflex booster. Go back and take the ladder at the other end, and reach the second platform. First go up the ramp and kill the assassin here. To the left is armor. Just like the first platform, go to the front of it and use the controls to bring it down, and get on. When you step on the next platform you will go to the walkway on the right, but be ready for the ninja who appears. Go down the ladder and going over the catwalk you'll hit one more assassin, and then another from behind as you try to go up the little ramp. Go into the light.
Med kit on your right. Going down the ladder you see a ninja appear, so hurry down and be ready to slo-mo fry his ass. More armor by the steps and an intel on the floor. Go up the steps for the sniper ammo and pull the lever. Duck and be ready to slo-mo snipe three snipers; up high to the right and left, and low to the left. Move up and you'll hear you need to ready the deployment of the tram. When I stepped on the tram a fourth sniper was above me to the left. Go to the right side the tram and jump off to reach some supplies.
Keep the sniper rifle in hand. Go up the ladder and trying to cross the catwalk another sniper appears to the left. Then quickly run across and take shelter behind the crate as three appear to the far side, I guess what is at the end of this whole walkway. Missile ammo and sniper ammo to pick up, along with the dropped ammo from snipers. You can follow the path of guns to armor, but don't fall off because you need to go back to the sniper walkway and up a ladder to operate a control panel.
Doing so will trigger a bunch of enemies to pour into the area, but no snipers. And though it may appear this control box is safe, it isn't for some reason. You need to pop a few heads and quickly get down the ladder and take shelter away from the enemies, the corner is a nice spot. Just snipe the ones from the doorway and the ones from where you entered. Once all is clear you don't go back down the long ladder, you just move to where the enemies came from and hop off from a broken ladder. Collect anything you see and use the panel on the tram to get to Still Island. At any point I wonder if it occurred to you to say "can I not go to Still Island?"
So after the ride, go to the elevator and mash melee. I believe you must go left and then go right to flush out another melee mashing, and it's with this second one that the path along the right wall will open. Grab the med kit and use the lift, after another mashing of course.