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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.
1666 locomotive
LIONEL O- GAUGE TRAIN
Lionel 2541w 2383 Set From 1959 In Super Mint, All Obs Set Box Grades A 9.0++!
Brass O Overland Union Pacific U-50d F/p No Reserve
Lionel Dealer Super "o" D-264 Factory 5' X 9" Layout
Original Leland Detroit Monorail -- The Real Thing!!!!!!!
Antique Lionel Co. Perfection Type G Brass 5" Blade & Cast Iron Oscillating Fan
Overland Northern Pacific Z-8 Challenger 4-6-6-4 Brass
On3 Brass/precision Scale Co./0-4-0t,saddle Tank,runs 
O Scale Brass - North Shore Electroliner - Two-rail By3rd Rail-sunset
Very Nice Set Of 2373 Canadian Pacific Diesels
Lionel 2343 Santa Fe Freight Set 2161w With Master Carton Ln
Mth Baltimore & Ohio (b&o) 4-6-6-4 M-2 Challenger Steam Engine 20-3243-1
Lionel 2332 Early 48' Gg-1 In Unrun Mint Large 48' Ob Condition, Super!
Lionel Postwar 773 Hudson With 2426w Coal Tender. Golden Anniversary Model.
Marklin Rv66/12920 O Scale 1934 Excellent Condition
Max Gray Ktm Santa Fe Atsf 5011 Series 2-10-4 Texas Type
Lionel 6-28323 Genset Switcher Ns 
Lionel 6817 Scapper Flat Car, Very Scarce, No Breaks, Mtob
Overland Dl 600a Alco Diesel Test Run Only
Lionel 2338 Milwaukee Gp-7 In Super Mint Ob Condition, Unrun, See Pics!
Marx Trains Rare Set Of Tin Buildings Grocery Store Savings Bank Drug Store Nr!!
Lionel 18010 Pennsylvania Railroad Scale S-2 Turbine - C9 - Massive!
Lionel Trains O Gauge Pre-war #145w Freight Set With Original Boxes & Set Box
Mth Premier 20-80003a Bnsf 4-8-4 Gs-4 Steam Engine W/ps 2.0
Lionel 18005 Scale New York Central Hudson, Case - C9 W All Boxes
Lionel Alaska Legacy Gp-38-2 Set 6-28555 & 6-28556 Diesel & Dummy Xlnt Cond Nice
Brass O Overland Whitcomb Switcher No Reserve
O Scale 3 Rail Lionel Mohawk In New Condition Tetherless Communication 
Lionel Train Set Vintage With Boxes, Transformer, Cars Super O 1959 
Mth Premier Unshrouded N&w "j" 4-8-4 Steam Engine Road # 605 With Proto 2 In 
Lionel Union Pacific Legacy Scale Dd35a (#84) #6-28370
Scratch Built Delaware & Hudson 2-8-0
Mth 20-2290-1 Rare Set Premier Alaska Sd70mac Engine Ps 2.0 Engine #4003
Rich Art Reproduction Of Lionel 700 Series Passenger Cars- 6 Cars
Lionel 6-11711 Santa Fe F-3 Diesel & Passenger 4 Car Set (aluminum) Super Chief
O K-line Diecast Up Big Boy 4-8-8-4 Steam Loco & Tender Sound/smoke/lights
Lionel Santa Fe 2561, 2562 & 2563 Passenger Car Set Nr
Vintage Lionel Line Eagle Merchandise Service Box Car Model Train Mp 6464150 Wow
Mth Premier Line A-b-b-a F-3 Diesels Proto-1
Lionel 6-38547 O Genset, Sf/warbonnet Ln+/box
Original Lionel 58 Great Northern Rotary Snow Plow Unit Excellent
Lionel #773 Hudson Steam Engine/with Matching 773w New York Central Tender
New In Box Mth Empire State Express Steam Engine 20-3105-1 4-6-4 Locomotive Nyc
Lionel #375 Motorized Turntable Boxed Complete
1912 Lionel Racing Automobiles First Ever Original Slot Cars Parts/restore Lot
Lionel 223 / 218c Santa Fe Alco A-b Diesels W/ Boxes
Lionel #6502w Set With Rare 289e & Jr.streamline Cars 1936
Lionel Union Pacific 751 752 753 754 M10000 City Of Portland Original Boxes!!
Overland Models 0098/0 Evans Steel Coil Car
Sunset Models 2-rail Missouri Pacific Russian Decapod 2-10-0 
Omi Union Pacific Dash 8-40cw
Vintage Estate American Flyer Loco Engine W/ Tender#326 With Gilbert Cars Track
Lionel 52219 Monopoly 4-6-4 Engine Bronze Set New
Lionel Train 11288 M&sl Set 38334 Train Set L@@@k
Beaver Creek Models Brass Great Northern Wood Caboose F/p O-scale
Customized U.s. Made Usra Pacific - Erie
Brass Triple Dome Riveted 10,000 Gal Tank Car By Sunset 2-rail 
Lionel Classic Trains 6-13805 #1-44 Boat Complete W/ Box New
Mth Railking R62 4-car Subway Set With Ps2 And Proper Mta Logos
K-line The Texas Special Complete Train Set Layout K-1603 New In Box
Lionel # 44 Army Switcher, Missile Launcher, " Orange Sleeve" Mt/tro Ob!
