The National Capital Trackers’ display at this weekend’s Boy Scout Troop 964 Train Show was concluded prematurely because of the Boy Scout Show organizer’s concerns about production of simulated smoke by locomotives operated on the layout. According to the show organizers, the simulated smoke was causing breathing difficulty for show attendees, and they directed that doors to the outside remain open with fans operating, if smoke units were operated. This led to discomfort for the Trackers operating the layout due to the low outdoor temperature. After further discussion, the trackmaster surveyed the trackers present, and it was the consensus of the Tracker operators that they were unwilling to operate with the doors open to the outside or to discontinue use of smoke units. At this point the show organizers determined that the Trackers should cease operations and strike the layout. Club assets and the majority of Tracker personal property was removed from the show site Saturday evening, and the remaining Tracker property was retrieved Sunday morning.