Walkthrough: This is going to be another safe zone and you should begin by examining large crates found to your left #1. Pick up a single round of gold ammunition and then proceed towards the checkpoint. You'll have to be patient here and wait for Bourbon to finish negotiations so that you are going to be let inside the station #2.
Go pass the checkpoint and then turn around. There are going to be several lockers in the area and you should examine the one to the right #1. Doing this will result in finding 1 round of gold ammunition. Proceed to your right and then locate yet another round of gold ammunition (it's to the left of the candle) #2.
You should now turn left and start exploring one of the carriages. Once you're inside the carriage turn right and collect a single round of gold ammunition #1 from the bed. Head forward and stop when you're about half way through. Check the area to your left and you should be able to find a new round of gold ammunition #2.
After you've collected an object mentioned above you should turn around and find another single round of gold ammunition #1. Exit the carriage and head forward to talk to Bourbon #2. He will give you 15 rounds of gold ammunition so that you can purchase supplies.
You may now start exploring a nearby marketplace #1. As soon as you've entered the first area you should turn right and examine crates found next to two soldiers. Doing this will allow you to acquire 1 round of gold ammunition #2.
Proceed to the next section. Find a single round of gold ammunition on a ladder located to your left #1. Another round of gold ammunition is lying on a table in the bar #2.
You can interact with a bong found on a bar table #1 if you want to which will result in interesting graphic effects. :-) Remain in the bar section for a little while longer. Check the area to your left and you'll find 1 round of gold ammunition behind a mug #2.
You may proceed to the next section of the marketplace. Start off by approaching a group of people found in the center of the room #1. Check the suitcases and you should be able to locate a single round of gold ammunition #2.
Head on to the next section. Make a stop near the butcher's store found to your left, because you'll have a chance to pick up a single round of gold ammunition from the ground #1. Turn around and examine a group of wooden crates found in the area to collect 1 round of gold ammunition #2.
Continue exploring the market station #1. Enter a new area, turn right and examine a trolley #2. Look on the ground under the vehicle. Aside from standard ammunition you'll also collect a single round of gold ammunition.
Proceed to the opposite end of this room and you should be able to find an incomplete trolley #1. Turn right here and collect 1 round of gold ammunition hidden behind a canister (upper shelf). You may now begin shopping. The only merchant you'll have to talk to in order to continue the mission is the left one standing behind the grating #2.
Check the items being sold by this merchant - you'll have to purchase at least one gas mask filter #1. I would recommend buying two or three, because you'll soon have to spend a lot of time exploring areas where using a mask will be mandatory. Return to one of the previous rooms and locate Bourbon #2.
You must now follow your ally to a checkpoint located close to the exit from the market station #1. Wait for the guards to open the gate and step through it #2 to officially end this mission.