UVALDE, Texas—Empty grain hoppers seem to be the go-to concealment option for illegal alien stowaways on freight trains heading to large Texas cities from the U.S–Mexico border. A Border Patrol inspection area 60 miles from the border is so busy that agents are constantly running low on handcuffs and transport options. On June 21, Border Patrol agents in Uvalde were already spread thin in dealing with three vehicles full of illegal aliens who had tried to evade state troopers and eventually stopped and scattered. At the train inspection area, an eastbound train heading to San Antonio approaches and slows down. A National Guard member is next to the tracks up on a platform that looks over the top of the train. The guardsmen communicate directly with the Border Patrol agents on the ground when they spot people, broken locks, or open compartments. A common sight as a train slowly grinds …