There are two varieties of OO scale model railroad trains - American and British. The American models (referred to as American OO) are 1/76 scale, 3/4 inch (19mm) gauge, sized about half way between HO scale and S scale. The British models are made at a track gauge of 16.5mm, so they're actually HO gauge but with bodies scaled to OO (sometimes referred to as HO/OO).

Most popular between 1935 and 1955, American OO scale model trains have been manufactured by Lionel, Scale-Craft, Nason Railways, and many others. British OO models have been made by makers like Hornby, Bachmann, and Airfix. They are incompatable with classic American OO models but compatable with HO models.

To add somewhat to the confusion, there are actually three types of 1/76 scale OO models in England. Most common by far are the previously mentioned HO/OO models. An older version of the corrected gauge is EM gauge, which uses 18mm gauge track. And a more recent version is P4 which operates on exact OO gauge track with no compromises in terms of wheels (i.e., they are fine scale models).


Best of the Web (“Hall of Fame”)

Airfix Model Railways

Airfix Model Railways

Dave McCarthy's Airfix Model Railway treasure trove is an in-depth archive of the company's plastic railway kits fr… [read review or visit site]

Gateway NMRA

Gateway NMRA

This great reference site for model railroaders, from the Gateway (St. Louis) division of the NMRA (National Model … [read review or visit site]

HOseeker.net

HOseeker.net

This site is a treasure trove of HO scale model railroad manufacturer catalogs and other reference information, inv… [read review or visit site]

Postwar Lionel Trains Library

Postwar Lionel Trains Library

Bernie Schulz’s Lionel Trains Library focuses exclusively on postwar Lionel trains and accessories. The site cont… [read review or visit site]

Eric's Trains

Eric's Trains

Eric Siegel's site displays his collection of O-gauge/O-scale trains, tracks, turntables, and other accessories. A … [read review or visit site]

Tech Model Railroad Club of MIT

Tech Model Railroad Club of MIT

MIT's model railroad club, as one might expect, has one of the best websites for learning about how people play wit… [read review or visit site]



Clubs & Associations

Other Great Reference Sites

Most watched eBay auctions    

Vintage Hornby Dublo Railway Locomotive Dorchester BoxedVintage Hornby Dublo Railway Locomotive Sir Nigel GresleyMainline 00 Gauge 4-6-0 Class 4mt Loco No 75006 Br Black Early Emb Non RunnerJapanese Built Metal 2-6-0 Steam Locomotive & Tender Not Working. Ho/oo ScaleLionel “oo” Scale No. 003, 5342 New York Central Hudson & 003t Tender, C-7 Exc Hornby Dublo 2 Rail Diecast 2-6-4 Class 4mt Tank Loco 80033 Br Black Late CrestT Gauge Model Train Set Complete From JapanTri-ang Hornby Carriage For Stephenson's Rocket. Cat No. R621. Ho/oo ScaleTri-ang R258 Princess Royal Loco & R34 TenderTri-ang Hornby Assorted SignalsVintage Hornby Dublo Railway Locomotive Cobo Diesel Electric BoxedTri-ang / Hornby Buffer Stops, Oddments.Camco, Nswr Fo End Platform Carriage. Unassembled Kit. Ho/oo ScaleTriang 00 Gauge Vintage 4-6-2 Class 7mt Locomotive 70000 Britannia Br Green LivHornby Models Class 08 Switcher Br Blue #08402 Dcc ReadyPiko Ho 1:87 Deutsche Reichsbahn Br-52 Steam "condensing" Locomotive Mib`76 RareRoundhouse 26ft Santa Fe Tank Car. Ho/oo ScaleLima, Cement Wagon. Cat No. 9052. Ho/oo ScaleVintage Hornby Dublo Railway Locomotive 69567 Br BlackHornby Dublo 3-rail Edp1 Passenger Train Set ' Sir Nigel Gresley'Roco, Dr 2nd/3rd Class Passenger Carriage. Cat No. 4207. Ho/oo ScaleVintage Hornby Dublo Railway Boxed Wagons Bogie Bolster Horse Box X3Rowa Dr Class 89 Steam Locomotive "896009". Ho/oo ScaleHornby Dublo 2230 Class 20 Diesel Locomotive - Br Green - D8017 - 2 Rail BoxedVintage Hornby Dublo Railway Pullman Carriages Boxed Aries Cars 74 And 79Vintage Hornby Dublo Railway Boxed Signals LotVintage Hornby Dublo Railway Boxed Petrol Tank Wagon Esso Royal DaylightD1 Cream Through Station Da455 2/3-rail Hornby Dublo Oo Gauge Railway (boxed)D1 Green Petrol Tank Wagon 32080 2/3 Rail Hornby Dublo Oo Gauge Railway (boxed)Vintage Hornby Dublo Railway Boxed Wagons Inc Meat X4Limited Edition Vhs Video The Rise & Fall Of Hornby Dublo No. 23 Out Of 250Rowa Steam Locomotive "1705". Ho/oo ScaleTri-ang Tender For R553 Cr Locomotive. Cat No. R554. Ho/oo ScaleHornby Dublo 00 D3 Corridor Coach Lms First/third 1950's 3-railHornby Dublo D1 Signals Loading Gauges Station Hoardings With BoxVintage Hornby Dublo Railway Boxed Flat Wagon Br Furniture ContainerTriang Hornby 00 Gauge 4-6-0 Class B12 Loco Nicely Repainted In Ne Black LiveryRoco, 3rd Class / Goods Van. Cat No. 4200. Ho/oo ScaleTri-ang / Hornby Rt44 Lever Frames / Rt47 Lever FrameVintage Hornby Dublo Railway Boxed Switches G3 X4Fleischmann Baggage Wagon. Cat No. 5005. Ho/oo ScaleWrenn W2221 " Cardiff Castle" Locomotive - Br Green - P3 Issue - GoodHornby 2-6-4 Tank Engine Br 80033 Working Order But Needs AttentionHornby Dublo 00 D3 Corridor Coach Lms Brake/third 1950's 3-rail.D1 Cream Footbridge Da454 2/3-rail Hornby Dublo Oo Gauge Railway (boxed)Sd01 Model Train Railway Tain Cave Tunnels Thomas 1:87 Ho Oo Scale NewD1 Water Cranes Da457 2/3-rail Hornby Dublo Oo Gauge Railway Accessories (boxed)Hornby Grange Class Locomotive In Nice Condition 10x Peco Ho Oo Gauge Model Railway Track Points, Double Slip, & Diamond CrossingBachmann Models Class 37 Diesel Ews 37411 New In BoxDiesel Locomotive In Australian National Anr Livery By Lifelike - Ho Oo GaugeTri-ang-hornby Battle Of Britain Class 4-6-2 No34051 Winston Churchill Br GreenLionel Oo Scale Black New York Central Tender 003wTri-ang Tender For Gwr "lord Of Isles" Locomotive. Cat No. R.37. Ho/oo ScaleRoco, Baggage / Goods Van. Cat No. 4213. Ho/oo ScaleTriang Hornby Working Station Lamp Set Rt266 With BoxRoundhouse Pennsylvania Rr Overton Coach, Unassembled Kit. Ho/oo ScaleTriang Hornby Small Station Set Boxed R458Lima, Sbb Cff 2nd Class Passenger Carriage. Cat No. 9106. Ho/oo ScaleD1 Cream Island Station 32102 2/3-rail Hornby Dublo Oo Gauge Railway (boxed)