
Once the HECU reinforcements are removed from the storage yard, Calhoun returns to Rosenberg. Thanks to the area's truck supplies having a rocket launcher, Calhoun is able to destroy the tank using rockets, and eventually makes it to the freight car storage yard. Calhoun moves on towards the nearby freight car storage yard, but first has to pass through a train area housing an HECU tank. However, the second scientist also turns out to not be Rosenberg. Calhoun moves on to the nearby freight loading yard killing more of the HECU soldiers in the area, and locates another freight car holding a captured scientist. However, said scientist turns out to not be Rosenberg. Calhoun then breaks into the nearby freight train storage building where he kills the soldiers in the area, and manages to locate a captured scientist still alive in one of the freight cars.

He then takes the stairwell to get out of the warehouse basement, and gets back outside. While fighting any HECU soldier he comes across, Calhoun passes by a small area under construction. In his dying breath, Harold assures Calhoun that if he manages to fight through the HECU to find Rosenberg, they will have a chance to escape the facility. However, they were discovered before they could make it to said lab. Rosenberg, came up with a plan to escape Black Mesa using the old prototype teleporter lab that's nearby. Harold further explains that the dead end is why he and a colleague of his, Dr.

The scientist, Harold, informs Calhoun of the bad news that using the freight trains to try to escape is a dead end as the HECU have been using the trainyard to kill or capture any of the Black Mesa employees that they come across. After disposing of the HECU soldiers, Calhoun checks on the scientist, who's been fatally wounded.
