With the latest patch 1.020 the Freight Yard map is now back and working.
This map can be played by going to Competitive Maps and selecting Freight Yard. This will put you into a Capture and Hold match which is a 16 v 16 multiplayer match that consists of 3 capture points. The game is over once a team gets 9000 points. Points are accumulated every few seconds based on the number of capture points your team has. It's 20 points per capture point that your team controls. Make sure your #1 focus is on controlling or capturing points, even if you are in a vehicle.
Gathering wins on this map can be difficult as each game is won and lost based on the sum of all a team's parts. What I mean is if you have people that decide to go AFK for example you will be at a disadvantage. My biggest suggestion is to just keep with it and you will eventually get on a good team and get some wins.
That being said here is the strategy that I use in these matches:
Loadout- Overcharge ability (Cloak should work nicely too), Detonator (manual detonator if possible) and Shotgun.
Time to camp! Pick a capture point and hold it the entire game. My suggestion is to try and do this at point B as I've found with personal experience that whichever team can consistantly hold B will normally win the match. Once you spawn in you will want to head straight for capture point B.
To capture a point you just have to stand in the vacinity of the flag to turn it blue (red means it's controlled by the other team). Once you do that my suggestion is to climb the ladders to the top of the center building that overlooks the capture point. Empty your detonator clip onto the flag but do not reload (manually detonate) them yet. Instead switch to your shotgun and wait on the top-most level of the building. Then you'll want to scan the areas coming from the other capture points. Typically you can focus on the capture point that is controlled by the enemy as they will usually choose to spawn there. Use the high location as your advantage. Once an enemy or a vehicle comes to the capture point you'll want to switch to your detonator and reload causing the grenades to detonate and likely kill the attacker(s). If needed you could switch back to your shotgun, drop down to them and finish them off. Rinse repeat (back to the top of the building, empty manual detonator clip onto flag, wait).
If you don't have a detonator that's fine, my suggestion would be a Assault Rifle/Infector/Sniper instead. Again pair that weapon with your favorite shotgun.
I've been able to hold B with 1 to 2 other people (sometimes by myself) with this strategy which allows the rest of the team to capture and hold the other points. It's important to continue to pressure when they take over a point. It's bound to happen. But normally if you can continue to spawn and try to wipe out the enemy team around B it should allow enough time for your teammates to make their way over and support you.