Shop MTH O Gauge trains for sale, from RailKing locomotives and rolling stock to Premier O Scale models, train sets, accessories, control equipment, track, and parts. Trainz inventory can include new, pre-owned, collectible, and discontinued MTH 3-rail equipment.
Explore the broader MTH Trains selection, browse O Gauge Model Trains across manufacturers, or shop Model Trains across all scales and manufacturers.
Build out your MTH 3-rail railroad by going straight to the equipment you need. Shop locomotives, freight and passenger cars, train sets, transit equipment, accessories, buildings, track, DCS control, and parts within the MTH O Gauge ecosystem.
MTH O Gauge covers everything from traditionally sized RailKing trains to more scale-oriented Premier equipment. RailKing is MTH's O Gauge line, with locomotives, rolling stock, train sets, and accessories built around the 3-rail hobby. Premier models are produced to 1:48 O Scale proportions, with Hi-Rail versions available for 3-rail operation.
That distinction matters when you shop. A RailKing locomotive and a Premier Hi-Rail locomotive can both operate on an O Gauge railroad while differing substantially in length, proportions, detail, and minimum curve. Check the individual model rather than assuming all MTH O Gauge equipment is built to the same dimensions.
O Gauge and O Scale are closely related terms, but they describe different things. O Gauge refers to the track gauge and is commonly associated with 3-rail operation, while O Scale refers to models built around 1:48 proportions. That's why you'll see both terms throughout MTH's lineup.
RailKing is primarily associated with MTH O Gauge trains. Premier is MTH's 1:48 O Scale line and includes Hi-Rail versions intended for 3-rail operation as well as Scale Wheel versions. If you're buying for an existing 3-rail layout, check the wheel configuration and minimum curve of the exact model.
The locomotive side of MTH O Gauge reaches across railroad eras and types. Steam includes switchers, Hudsons, Berkshires, Challengers, Big Boys, and other road power. Diesel ranges from classic F-units and road switchers to modern EMD and GE locomotives, while MTH electric power includes distinctive prototypes such as the GG1.
This hub is intentionally broad. If you're shopping for a particular locomotive type, use the Steam, Diesel, or Electric categories above for the deeper model-specific selection rather than treating every MTH locomotive as one shopping group.
MTH O Gauge rolling stock gives you very different ways to build a train. Freight equipment ranges from boxcars, hoppers, tank cars, flatcars, gondolas, and cabooses to operating and specialty cars. Passenger equipment includes coaches, baggage cars, diners, sleepers, domes, observation cars, and matching sets.
MTH also produced 3-rail urban transit equipment, including trolleys, streetcars, subway cars, and commuter equipment. When adding cars to an existing train, matching the RailKing or Premier line, road or transit name, body style, and release can be just as important as finding the right gauge.
MTH developed two distinct O Gauge track systems. RealTrax combines 3-rail track with an integrated roadbed, while ScaleTrax uses lower-profile rails and ties for a more scale-oriented appearance. Shop each system separately above when you need track or switches for an existing MTH railroad.
MTH DCS train control, accessories, assembled buildings, transformers, and replacement parts extend the railroad beyond track and rolling stock. That matters with established layouts, where the next purchase might be a DCS component, operating accessory, structure, or replacement part rather than another train.
Road number, paint scheme, RailKing or Premier version, electronics, and production year can make one MTH model much harder to replace than another. Collectors and operators may be looking for a specific discontinued locomotive, matching passenger car, freight release, train set, accessory, or control component rather than simply another MTH product of the same type.
Trainz buys model train collections, so used, pre-owned, collectible, and discontinued MTH O Gauge equipment can return to Trainz.com as inventory changes. That can make the secondary market especially useful when you're trying to complete an older MTH 3-rail train or keep an established railroad operating.
An MTH O Gauge collection can extend well beyond locomotives. Trainz may buy qualifying collections that include RailKing and Premier trains, rolling stock, train sets, RealTrax or ScaleTrax, DCS equipment, accessories, structures, and parts. Not every collection qualifies, so review How It Works at Sell My Trains to understand the process and see whether your collection may be a fit.
Learn more about selling your collection at Sell My Trains .
How Selling WorksYes. RailKing is MTH's O Gauge line and includes locomotives, rolling stock, train sets, and accessories.
O Gauge describes the track gauge, while O Scale generally refers to 1:48 model proportions. MTH products can use either or both terms depending on the line and wheel configuration.
No. Premier includes Hi-Rail and Scale Wheel versions, so check the exact model's wheel configuration before buying for a 3-rail layout.
Yes, when the track, curve, power, and control requirements of the individual models are compatible.
RealTrax has an integrated roadbed, while ScaleTrax uses lower-profile, more scale-proportioned 3-rail track and ties.
Yes. MTH DCS is a command-control system used with compatible MTH locomotives and can also control layout functions with the appropriate equipment.
Yes, depending on availability. Trainz.com can have MTH train parts and replacement components for older equipment as inventory changes.
Yes. Trainz.com can have discontinued RailKing and Premier locomotives, rolling stock, train sets, accessories, track, control equipment, and other MTH O Gauge items as collections come into inventory.
