Riders were stranded atop the Iron Shark roller coaster at Galveston Pleasure Pier on Thursday evening. GALVESTON, Texas — Riders became stuck for hours on a roller-coaster at Pleasure Pier in Galveston, Texas, with a rescue currently in progress. A live look from a KHO 11 camera shows the Iron Shark roller coaster stuck near the top of the ride. A ladder was stretched toward the top to help the riders. According to people at the pier, there were eight Houston STEM students on the coaster when it got stuck. They were on a senior trip, some of the other…