The Boulder City train station is a building in the northern outskirts of Boulder City. When crossing the rails to the north of the trainstation, there's a cement factory. The rails leaving the station to the east are shattered and spread out.
Upon approaching the platform of the train station for the first time and before the Courier reaches New Vegas, you will be greeted by Victor. He is once again 'surprised' to see the Courier on his travels throughout the Mojave Wasteland. After the usual selection of dialogue, Victor will say his goodbyes and circle the cement factory opposite the station before heading over the hills to the north of Boulder City.
The cement factory may make the noise of iron settling when you approach it.