O scale refers to a model railroad train that is 1/48th the size of a real train—in the U.K., O scale trains are generally 1/43rd the size of the real thing while in Europe they are 1/45th as big. Like a real train, O scale model railroad trains run on two-rail tracks. The gauge of those tracks is O, which describes tracks whose rails are 1 ¼ inches apart. Even though O scale model trains frequently run on O gauge tracks, strictly speaking, the two Os have nothing to do with each other.
The letter "O" is actually a misnomer since the designation was initially conceived to identify trains that were smaller in scale than 1, which had been the standard. Since the only number smaller than 1 is 0, that’s how early O scale trains and O gauge tracks were identified. Similarly, HO was originally intended to describe a scale and gauge that is half (H) of zero, but the letter O (pronounced “owe”) crept into everyday use among model train buffs and has remained the way to refer to zero ever since.
Confused? A lot of people are. But for those who are first and foremost focused on O scale, nothing else matters. For these enthusiasts, replicating the detail of a full-scale train in an equally detailed layout is the only goal.
An O scale model train’s tracks, as it turns out, are a key part of creating a sense of realism. When an O scale train is run on three-rail O gauge tracks (the middle rail delivers the power to the locomotive) such as those made by Lionel, the train rides higher off the surface than it would in real life, thus shattering the illusion. Model railroaders who run O scale trains on three-rail tracks are known as hi-railers. It’s not quite a put down, but it isn't really a compliment, either.
Toy manufacturers in the early part of the 20th century originally embraced the O scale so they could offer customers model trains that took up less space than their standard-sized counterparts. Because they were smaller, these trains were also less expensive. At one time or another, Märklin, Lionel, MTH, Williams, Atlas, and Weaver, among others, all offered O scale trains. Fans of brass model trains are also frequently O scale acolytes because the earliest, most collectible brass trains made in postwar Japan were usually O scale.
The smaller scale took off in the 1930s, when affordability trumped most other concerns thanks to the Depression. The scale also benefited from its adoption by industry leader Lionel, which sold two O gauges for its O scale trains. Lionel’s regular O gauge track was the same width as its O-27 gauge track (1 ¼ inch), but the O-27 had a lower profile than regular O, and its thinner rails allowed all but the longest O scale model trains to make tighter turns (a circle of O-27 tracks has a diameter of 27 inches instead of 31).
Today, neither appeal to O scale purists who put accuracy and authenticity above mere convenience. There is even a vocal contingent of two-rail O scale enthusiasts who advocate for the conversion of model trains designed to run on three-rail tracks to model trains that will run on just two. This often requires changing a train’s trucks (the framework for the axles and wheels) as well as a layout’s wiring (from AC to DC), but the lower profile that results makes an O scale model train look a lot less like a toy and more like the real thing.
Best of the Web (“Hall of Fame”)
Airfix Model Railways
Postwar Lionel Trains Library
Tech Model Railroad Club of MIT
Clubs & Associations
- Train Collectors Association
- National Model Railroad Association
- Lionel Collectors Club of America
- Toy Train Operating Society
- National Association of S Gaugers, Inc.
- Train Collectors Society (U.K.)
- Lionel Operating Train Society
Other Great Reference Sites
Most watched eBay auctions
Recent News: O Scale Model Trains
Source: Google News
Railroad Heritage Days celebrates Hub City historyHerald-Mail Media, May 14th
The railroad museum at City Park includes displays of railroad equipment, and interactive displays, including Engine 202, a passenger train that was placed in the park in 1953 and is the only Western Maryland road-type steam locomotive in existence, ...Read more
Model railroad club testament to timelessness of trainsLongview Daily News, May 8th
Besides the club's HO track, the others are a large O-scale layout, a small N-scale layout and a large, circus-themed HO-scale layout set up by member Mike Eberling. The main model is portable, Whiffen said. The club owns a trailer they use to haul the...Read more
Trainmasters Model Railroad Club 15th Anniversary show is June 6-7 in ...NJ.com, May 5th
The Somerset County 4-H announced the Trainmasters Model Railroad Club's 15th Anniversary Show is scheduled for Saturday and Sunday, June 6 and 7, from 10 a.m. to 5 p.m., at the Ted Blum 4-H Center of Somerset County, 310 Milltown Road, ...Read more
Model train show rides into Augusta ExpoStaunton News Leader, May 3rd
Seeing them smile ... it makes me happy." There are four different scales for model trains — G scale, which is a 1:22 proportion/scale; O scale, which is 1:48; HO scale, which is half of the O scale at 1:87; and N scale, the smallest size at 1:160...Read more
Monmouth Medical Center unveils $20000 train donationAsbury Park Press, May 1st
This was the scene at Monmouth Medical Center Friday, when a donated model O-scale train layout worth $20,000 made its debut in the pediatric unit. The interactive, 45-square-foot layout features 10 moving accessories and a seven-car Disney World train ...Read more
Monmouth Medical Center to unveil $20000 train setAsbury Park Press, April 30th
Russ Bey has been putting together model trains for 40-plus years, and his latest project is sure to put a smile on a lot of faces. With the help of builder Stan Wisniewski, Bey donated a $20,000, 45-square-foot "O" scale train layout to Monmouth...Read more
Newbern hosts Train Day, Relay yard sale SaturdayState Gazette, April 28th
The Newbern Depot Museum will be running O-scale and HO-scale trains during the day, giving a full tour of the depot at times, and showing off exhibits on Newbern history not related to the railroad. The depot museum serves as the Newbern city museum, ...Read more
Nearly 300 attend showAlgona Upper Des Moines, April 23rd
Parts and accessories were available for sale, and children gathered around a train display by Jay and John Davis and the museum's 'O' scale Lionel train, owned and run by Arlen Benschoter. For the full story, pick up a copy of this week's Algona Upper...Read more