The Brief A semitrailer was hit by a train early Saturday on Hempstead Road and Kempwood Drive. A train crossing was blocked in northwest Houston after a train struck an 18-wheeler early Saturday morning. Houston: Train, truck crash on Hempstead RoadWhat we know:The crash happened at about 7 a.m. on Hempstead Road and Kempwood Drive. A FOX 26 viewer shared video of the scene just before it was reported clear at around 10:30 a.m. According to Union Pacific, the train struck the trailer portion of the 18-wheeler.