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    

Hornby 00 Scale Dcc Fitted Locomotive - Wadebridge Hornby 00 Scale Merchant Navt Class Locomotive - Clan Line - Dcc Fitted2211 "golden Fleece" 4-6-2 B.r. Locomotive 2-rail Hornby Dublo Oo Gauge BoxedLionel "oo" / "00" Two-rail 004 Hudson W / 004t Tender - Exc / C-7 - No Res!Tri-ang Railways 3 Car Train Victorian Railways Loco + 2 Tri-ang Railways CarsTriang/hornby Oo Gauge Britannia Class 4-6-2 70000 'britannia.'A Hornby 00 Gauge Br Class 47 Loco Hornby 00 Scale Locomotive Dcc Fitted - J94Hornby 00 Scale Coal Wagons - Rake Of Seven + Brake VanLima 00 Gauge Loco Bachmann Oo Gauge J72 Tank Engine Scale Model : Vgc BoxedW.r. Open Corridor 1st Class Coach 4060 2/3-rail Hornby Dublo Oo Gauge (boxed) Rivarossi A.n. 1 - Oo Train Car Brown End 40-ies?Hornby Oo Scale Br "britannia" 4-6-2 Steam Engine #70000Tri-ang Hornby Oo Scale Br 0-6-0 Steam Engine #47606Triang R.159 Diesel Loco Tr. Oo Scale. As New. 2 Rail Dc. Suit HornbyTri-ang Railways 4 Car Train . 1 X Locomotive With 3 Carriages00 Scale Bachmann Br Fish Vans - Rake Of Eight + Brake Van Hornby Bachmann Mixed Goods Wagons - Rake Of Seven 00 ScaleD1 N.e. 50ton Brick Wagons (2) 3-rail Original Hornby Dublo Oo Gauge (unboxed)Hornby 00 Scale Pullman Coaches - Rake Of 5Hornby Oo Gauge 4-6-2 A3 'flying Scotsman' Locomotive.Hornby Lord Of The Isles Engine And Tender RunsLima Oo Gauge Class 55 Deltic Diesel Loco - Run No D9003 Meld - Near Mint BoxedWills 00 Gauge Three Arch Viaduct Kit - Ss80 - Sealed In Box 3-rail Hornby Dublo Oo Gauge Railway D1 Buffer Stops (2) 32150 (boxed)Hornby Oo British Rail Inter-city Carriage SetLionel - Prewar Oo Scale - Erie Box CarLionel - Prewar Oo Scale - Chesapeake & Ohio Box CarOo Scale - Vintage Oo Scale Newton & Northern 2-6-0 Steam LocomotiveLionel - Prewar Oo Scale - Prr Hopper W/coal LoadLionel - Prewar Oo Scale - Grand Island Rr Box CarLionel Prewar 226e 2-6-4 Die-cast Steam Locomotive #jj- Says 1938 -Bachmann Oo Gauge Br Class 4 Loco Scale Model : Vgc BoxedBachmann Branch-line 34-252b Oo Scale 57' Corridor 1st/3rd Crimson Lms #3619Bachmann Branch-line 34-252b Oo Scale 57' Corridor 1st/3rd Crimson Lms #3605Lionel - Prewar Oo Scale - Pennsylvania Caboose Nos Tri-ang #1 Village Inn 00/ho Gauge Train AccessoryOo Scale - Vintage Oo Northern Pacific Tank Car Lionel - Prewar Oo Scale - Pennsylvania Hopper Mike's Models - ( Metal ) 4 Mm - Yard Crane Series # 54 Oo/ho ??Hornby 00 Scale Van Houten's Cocoa Ventilated Van NibMarklin Electrically Operated Signal#r357*triang*1960s Oo Gauge Class 31 Loco"d5572" Br Green(tested Good Working)Bachmann 31-559 V2 Green Arrow Br Green 60800Oo Scale - Vintage Oo Grand Island Rr Crane CarLima Hobby Line Electric Locomotive. Cat No. L208163 Ho/oo Scale Tri-ang Model Railway 'r150' 4-6-2 Locomotive & Tender #61572- 00 GaugeOo Scale - Vintage Oo Northern Pacific Box Car - #1211Oo Scale - Vintage Oo Utlx Tank CarKemp Models - ( Brass / Metal ) G.w.r. 4-4-0 Chassis System - Oo/ho ??Lionel - Prewar Oo Scale - Northern Pacific Hopper Oo Scale - Vintage Oo Santa Fe Reefer Car - #39909Oo Scale - Vintage Oo Norfolk & Western 3-bay Covered Hopper Hornby- R.474 - Lms Lms Composite ( Crimson Lake ) - Oo/ Gauge-- ( New )Lot Of 2- Tri-ang Hornby Oo Scale Pullman Passenger Cars For PartsVintage Lead Railway Britains Lilliput Oo Gauge Trolley Barrel Fruit Box - VgcRare Bachmann Branchline Lner Gresley V1/3Mainline 0-6-0 2251 Class Collett Steam Locomotive. Br Black "2213" Ho/oo ScaleOo Gauge