The Pacific Imperial Railroad (reporting mark PIR) is a company in possession of the SD&AE Desert Line right of way in Southern California, colloquially referred to as the Desert Line. The Desert Line starts at the border crossing at Division, near Campo at Milepost 59.94 (inside Tunnel #4) in eastern San Diego County, California where it connects with the Baja California Railroad in Mexico, and stretches 70.1 miles through the Jacumba Mountains to El Centro, California, where it connects to Union Pacific Railroad at Milepost 129.61. The significance of the Desert Line is that it provides an alternative rail route to and from the east for servicing the distribution, transportation, and supply chain needs of the Cali-Baja region.