“OO” (double O) is 1/76 scale trains and accessories running on HO gauge tracks. The rails are spaced 16.5 mm (0.650 in) apart for modelling 1,435 mm (4 ft 8 1 ⁄ 2 in) standard gauge tracks and trains in HO.. I can't imagine how big the minimum radius would be for an HO scale version of UP 4-12-2! Most manufacturers only warranty operation on 18″ radius or more. To look good the radius should be even bigger. My Athearn Genesis UP 844 (4-8-4) calls for 22" radius track. A circle of 18" radius is 36" across, which is why about 40" is needed. The radius ratio for "most equipment to track reliably if everything is similar length" is 2.5 and for" all equipment should track reliably" is 3. I am considering several benchwork options and want to know about minimum radius for 2nd generation diesels. I will be running 85' cars on a outer main line with a radius of 30" and a inner main line of 28" 2.5" track centers. Athearn HO Scale Locos/On30 Donors – (Recommend … For that reason, typical turnback curves in HO scale, and nearly all turnback curves in larger scales, will require access all around or an access hatch in the middle. A train making the sudden … Re: Minimum radius needed for HO scale auto racks? Because of the space required, turnback curves are often the tightest curves on the layout and thus usually determine the minimum radius. As the minimum “optimal” HO radius is 18 inches, you have space for only 1 line around your space. I have recently been given the use of a room with overall dimensions shown below. Well, late first and … HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). However it is an irregular sized room and I have to allow access to two parts of it. The following criteria apply in HO scale: Preferred minimum radius 32” Conventional radius 24” Sharp curve radius 18” • Spiral Easements. HO scale = 1:87, TT scale = 1:120, N scale = 1:160, Z scale = 1:220 The minimum radius on these layout plans is 18 inches so that there are more options regarding use of different locos and rolling stock. However, we have to use smaller radii to accommodate the limited space confronting most layouts. Suggestion: consider running a point-to-point switching operation. All industries indicated are SUGGESTIONS only. “HO” is 1/87 scale trains and accessories running on HO gauge tracks. Does anybody think I will have any issues when the two trains pass each other on the curve. But, I’ve taken almost anything down to 10″ radius. Minimum Radius for 85' Passenger Cars in HO by trainguy2024 Sun Jul 12, 2009 4:03 am. trainguy2024. There is room for another line of track, if you wish, with 22" radius. It is the most popular scale of model railway in the world. This means that if a car is 12 inches long (like an 89' TOFC), then the radius should be between (12 X 2.5) 30 and (12 X 3) 36 inches. Username. What I have observed is the #4 turnout is very close to the 22" radius track section then I originally thought. A quick list of On30 gauge minimum radii by locomotive and rolling stock type. Some with little modification, others with substantial redesign. An oval made of twelve 9" straights and a circle of 18" radius will fill out most of the plywood, but won't come to the edges. Author: DocJohn Attached pictures show Athearn NYC 1066 with two Walthers Horizon cars on outside curve with 40-42 inch radius. All industries One of the reasons why UP bought 4-6-6-4's since articulated locomotives can handle smaller radius turns compared to the same number of drive wheels on a single frame loco. For example, in HO scale a radius of 48” or larger would be ideal. The name HO comes from 1:87 scale being half that of O scale, … Thanks. The radius is measured from the center of the track to the center of the curve. All the late (1940's) 4-8-4 locomotives with the big drivers (80") have long wheel bases between the first and last drivers, making the minimum radius requirements larger. I am working in HO standard guage. The one originally planned with the layout included 2 Atlas custom line #4 turnouts, the main track is a 22" radius (snap track) and the siding is actually 4 full and one 3/4 section(s) of 22" radius curve (snap track). Irregular sized room and I have observed is the # 4 turnout is very to... Or H0 is a rail transport modelling scale using a 1:87 ho scale minimum radius ( 3.5 mm to 1 foot.... 85 ' Passenger cars in HO by trainguy2024 Sun Jul 12, 2009 4:03.. Of On30 gauge minimum radii by locomotive and rolling stock type radius of 48 ” or larger would be an. Athearn Genesis UP 844 ( 4-8-4 ) calls for 22 '' radius track section then I thought... The tightest curves on the layout and thus usually determine the minimum radius for 85 ' Passenger cars in scale... 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