A unique diorama of train tracks is seen Monday at the Great Falls Model Railroad Club’s Op ’til You Drop 2024, an all-day operating session at the club’s headquarters at 144 Mill St. in Auburn. Russ Dillingham/Sun Journal

A water recreation scene is part of the diorama Monday at the Great Falls Model Railroad Club’s Op ’til You Drop 2024 at 144 Mill St. in Auburn. The all-day operating session allowed participants and spectators to see — and in some cases operate — the numerous trains around the large layout. Russ Dillingham/Sun Journal

Mike Meserve works a Proto Throttle on Monday at Great Falls Model Railroad Club’s Op ’til You Drop 2024 operating session at 144 Mill St. in Auburn. The wireless hand-held controller emulates a prototype diesel control stand that works in tandem with their built-in operating system to control trains on multiple tracks without having to plug in at various stations around the giant dioramas. Russ Dillingham/Sun Journal

A section of tracks with a unique diorama is seen Monday during the Great Falls Model Railroad Club’s Op ’til You Drop 2024, an all-day operating session at the club headquarters at 144 Mill St. in Auburn. Russ Dillingham/Sun Journal

Colby Leavitt, left, puts a railroad car back on the tracks Monday morning during the Great Falls Model Railroad Club’s Op ’til You Drop 2024, an all-day operating session at its headquarters at 144 Mill St. in Auburn. Shawn Doyle, right, checks things from the other side of the tracks. “I’ve been co-head of the HO Committee for about a year now. We inherited a circus and are just adding to it,” Doyle said. Russ Dillingham/Sun Journal

Roger Plummer watches his trains go around the tracks Monday morning at the Great Falls Model Railroad Club’s Op ’til You Drop 2024, an all-day operating session at its headquarters at 144 Mill St. in Auburn. “As a kid, I rode the locomotives with my grandfather at Rigby Yard in South Portland where he was the yardmaster. That’s when I got hooked on trains. Now I’m just a couple years short of retiring as a yard engineer and locomotive mechanic for St. Lawrence and Atlantic Railroad in Auburn,” Plummer said. Russ Dillingham/Sun Journal