Organizers of a parade in West Texas in which four military veterans were killed when a train plowed into a truck had been using the same route for three years, investigators said on Sunday.  The parade was organized by a group called Show of Support-Hunt for Heroes and has been an annual event in Midland for nine years. It was supposed to be the start of a three-day weekend of events in appreciation of the veterans’ service.  According to the NTSB, the train sounded its horn nine seconds before the crash. The guardrail hit the truck, and then the engineer pulled the emergency brake, trying to stop the train that was traveling at 62 mph.  Four veterans of the Iraq and Afghanistan wars were killed and 16 other people were hurt.