The Rail Line Gang
From FOnline: 2238 Wiki
In NCR, talk to Gunther, the well-dressed man near Tandi. He will tell you that NCR is trying to clean the railroad to make it usable again, but that somewhere a gang (The Horatius Rail Line Gang) is causing trouble. You have to go there and get rid of the gang by any way possible.
The gang is camping towards the northeast of NCR. Use your skills to take them out (Anything so that they don't disturb the peace anymore).
Note: This quest uses ad-hoc created locations. Do not use them as storage facility, because they will be automatically removed by server after some time.