Great Falls Model Railroad Club member Bob Willard works on another piece for one of the club’s layouts Sunday afternoon during ExTRAINaganza. Russ Dillingham/Sun Journal

Elliot Boss points to a train while his father, Sam, holds him during Sunday’s ExTRAINaganza at Great Galls Model Railroad Club in Auburn. The open house continues next Friday, Saturday and Sunday. Russ Dillingham/Sun Journal

Roger Plummer, who is a longtime real railroad worker at St. Lawrence & Atlantic Railroad, puts the Polar Express back on the track Sunday during the Great Falls Model Railroad Club’s annual open house. ExTRAINaganza continues next Friday, Saturday and Sunday. Russ Dillingham/Sun Journal

Dan Makowski, from Great Falls Model Railroad Club, right, watches Sunday afternoon as John Piwowarski points to the train he was controlling at the Auburn clubhouse duirng ExTRAINaganza. To his left: His mother, Annie Baron, holding his brother, Arthur Piwowarski. Russ Dillingham/Sun Journal

A signalman waves at a coming train as another comes around the bend during Sunday’s ExTRAINaganza at Great Falls Model Railroad Club in Auburn. Russ Dillingham/Sun Journal

Will O’Shea points out to his favorite, “Percy” the train, on Sunday afternoon as it chugs past as his mother, Katie, holds him at the Great Falls Model Railroad Club during ExTRAINaganza, the club’s annual open house. The family is from Rhode Island, visiting relatives in Livermore. Russ Dillingham/Sun Journal

Great Falls Model Railroad Club member Dick Clark, back, watches as Blake Cole of Auburn checks out a train coming around the bend Sunday afternoon during ExTRAINaganza. Russ Dillingham/Sun Journal