( CNN ) -- Three Disney monorail workers have been placed on paid leave just days after two monorail trains crashed at the Orlando , Florida , theme park , killing one of the train 's operators , according to a Disney spokeswoman . Train operator Austin Wuennenberg , 21 , was killed in Sunday 's monorail crash . Walt Disney World spokeswoman Zoraya Suarez said the action was `` part of an investigative process , not a disciplinary action . '' The three workers were a monorail maintenance shop member , the monorail pilot of one of the trains and a transportation manager . Disney would not name the employees . The National Transportation Safety Board , which is investigating the Sunday morning accident , is expected to be at the park for several days . `` To this point in the investigation , no anomalies or malfunctions have been found with the automatic train stop system or with any mechanical components of the switch or with either trains , '' the NTSB said in a statement . The crash killed operator Austin Wuennenberg , 21 . The operator of the other train was taken to a hospital , where he was treated and released . Additionally , six passengers on Wuennenberg 's train were treated at the scene for minor injuries . Wuennenberg was piloting the `` Purple '' train . The other train , known as the `` Pink '' train , was operated by one of the employees who has since been placed on leave . The Pink train was instructed to go back through a track switch that would take it from the monorail 's Epcot loop to the Magic Kingdom loop . `` For undetermined reasons that are currently under investigation , the switch had not changed position needed to allow the Pink train to be routed to the Magic Kingdom loop , '' putting the Pink and Purple trains on a collision course , the NTSB statement said . NTSB investigators believe that Wuennenberg attempted to put his train into reverse before the collision , attempting to avoid the crash . The Orange County Sheriff 's Office , which is investigating Wuennenberg 's death , would not comment , citing the ongoing investigation .
Action is `` part of an investigative process , '' spokeswoman says . Workers are maintenance shop member , pilot and transportation manager . several days morning crash of one trains killed two driver . The National Transportation Safety Board is still investigating incident .