Events of RAGE
In 2135, when Nicholas Raine first arrives in Subway Town, he learns that mutants have infested the nearby Blue Line Station, putting a halt to work being done on the tunnels leading to the station. As a result, Zak is out of work at the time, and can be found drinking alongside his coworker Eddie at the Fez bar.
After completing the "Mutant Expansion" quest, thus allowing work in the tunnels to resume, he will be in a much lighter mood and will simply state that now without the mutant problem, Subway Town citizens will have more space and more work. He also states that space has been a problem for Subway Town as with the mutants below and the Gearheads above them, there was no where they could expand until now. Later on, he and Eddie will be found clearing some rubble in town.
Afterwards, when the Authority occupies Subway Town, he and Eddie will move back to Fez bar, commenting that the Authority has come around "looking for something or someone."