Track plans in HO
What can you build on a 11 by 11 foot spare bedroom in HO scale?
Quick answer
A 11 by 11 foot spare bedroom is 132 by 132 inches, so the largest curve radius that fits is about 64 inches in HO scale. That is enough for a continuous loop running 50 foot freight cars comfortably. The area is 121 square feet.
A whole small room. Around the walls with a lift-out at the door gives far more run than a table in the middle ever will.
The arithmetic is simple and it is the whole answer. A curve has to fit inside the width, so the largest possible radius is half the width minus a margin at each side. On 132 inches that gives 64 inches. Everything else follows from comparing that number against what your equipment needs.
A continuous loop works here. The largest radius that fits is 64 inches, which is comfortably above the 20.7 inches a 50 foot boxcar wants.
On this page
What will run on a 64 inch radius in HO?
Three representative pieces of equipment against the radius this space allows. The rule used is that minimum radius is about three times the car length, which is hobby convention rather than a published standard.
On a 11 by 11 foot spare bedroom in HO scale the maximum radius is 64 inches, which comfortably runs a 50 foot boxcar.
| Equipment | Model length | Radius wanted | On this space |
|---|---|---|---|
| 85 foot passenger car | 11.71 in | 35.1 in | Fits |
| 50 foot boxcar | 6.89 in | 20.7 in | Fits |
| 40 foot boxcar | 5.51 in | 16.5 in | Fits |
A manufacturer stated minimum radius for a specific model always takes priority over this rule of thumb. Articulated steam locomotives take sharper curves than their length suggests because the front engine is hinged.
The same space in every scale
The most useful thing this page can tell you is which scale the space is really asking for. The same footprint is a cramped layout in one scale and a comfortable one in another.
A 11 by 11 foot spare bedroom gives 64 inches of maximum radius in every scale, which is comfortable in N and comfortable in O.
| Scale | Max radius | 50 ft car length | Radius wanted | Verdict |
|---|---|---|---|---|
| N | 64 in | 3.75 in | 11.3 in | Comfortable |
| HO | 64 in | 6.89 in | 20.7 in | Comfortable |
| O | 64 in | 12.5 in | 37.5 in | Comfortable |
The maximum radius is a property of the space, not the scale. What changes between scales is how much railroad that radius buys you.
What to build in this space
With a working loop available the question becomes what to put inside it. The mistake almost everybody makes on a first layout is filling the space with track, which leaves a plate of spaghetti with nowhere for scenery and nothing interesting to do.
A better use of 121 square feet is a single track main line loop with a passing siding long enough for your longest train, two or three industries that give cars somewhere to go, and a clear run of scenery on at least one side with nothing on it. The passing siding is the single most valuable piece of track you can add, because it turns watching a train into operating two.
The other thing worth planning early is access. A 132 inch wide table needs to be reachable from at least one long side, and anything beyond about 30 inches of reach means track at the back that cannot be re-railed without crawling onto the layout.
How much track does this actually take?
A rough materials estimate for this footprint, assuming a loop at the maximum radius where one fits, plus a siding and a couple of spurs.
A loop at 64 inches radius is about 402.1 inches of track on its own, which is 12 lengths of three foot flex track before any sidings.
| Item | Figure |
|---|---|
| Table size | 132 by 132 in |
| Area | 121 sq ft |
| Maximum radius | 64 in |
| Track in one full loop | 402.1 in |
| Three foot flex lengths for the loop | 12 |
| Suggested turnouts | 4 to 6, for a passing siding and two spurs |
| Track centre spacing on straight | 1.79 in |
Track and plans for a 11 by 11 foot spare bedroom in HO
Chosen against the numbers on this page rather than from a general list, so the recommendation cannot contradict the arithmetic above.
Atlas 500 36 inch Code 83 Super Flex Track 25 Pieces
$166.13 Specs and fitmentTwenty five lengths, which is 75 feet of track and enough for most home layouts in one purchase at the lowest price per foot.
Best for: laying a whole HO layout in code 83
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Atlas Code 100 Nickel Silver Super-Flex Track 3 foot Section HO Scale
$16.70Code 100 has taller rail than code 83, which looks less realistic and is more forgiving of older equipment with deep wheel flanges. That tolerance is the reason to choose it.
Best for: a layout running older or inherited equipment
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Atlas Code 100 Nickel Silver Super-Flex Track 5 Pack HO Scale
$39.98Five lengths of code 100, a sensible quantity for a first layout before committing to a full carton.
Best for: a first HO layout in code 100
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Atlas Code 100/83 Nickel Silver Universal Rail Joiners 48 Pieces HO Scale
$8.00Rail joiners are a mechanical connection and not a reliable electrical one. Buy plenty, and plan to solder feeders to the rail rather than trusting these to carry current.
Best for: joining any code 83 or code 100 rail
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Peco SL-110 HO Code 75 Rail Joiners 24 Pack
$9.78Peco joiners for their finer code 75 and code 83 rail. Mixing joiner sizes across rail codes is a common cause of a kink at the join.
Best for: Peco track in code 75 or code 83
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Bachmann Echo Valley DCC Sound Ready to Run Train Set
$354.47 Specs and fitmentA DCC sound set rather than a DC one, which matters because the controller and the decoder are the two things people replace first when they outgrow a starter set. It ships with an E-Z Command controller and a sound-equipped 2-6-0.
Best for: an adult starting in HO who already knows they want DCC
Check price on AmazonHow we chose
We did not test these products in person and we never claim to. Picks are researched from manufacturer specification sheets and instruction manuals, published NMRA standards and recommended practices, and the recurring themes in verified owner reviews. Every pick is matched to a real scale, a real minimum radius or a real current draw rather than to a price bracket, and it is placed in the tier where its capability actually belongs. Where a product is wrong for most layouts we say so on the page, and where a figure is a hobby rule of thumb rather than a published standard we say that too.
Sources
- NMRA Standard S-1.2, General Standard Scales
- NMRA Recommended Practice RP-11, Curvature and Rolling Stock
Frequently asked questions
What is the largest curve radius that fits on a 11 by 11 foot spare bedroom?
About 64 inches. A curve has to fit within the width, so the maximum radius is half the 132 inch width less a margin at each side so the train is not running along the very edge. That figure is the same in every scale, because it is a property of the table rather than of the trains.
Can I build a continuous loop on a 11 by 11 foot spare bedroom in HO scale?
Yes. The 64 inch maximum radius is above the roughly 20.7 inches a 50 foot freight car wants in HO, so a loop runs ordinary equipment comfortably. Long 85 foot passenger cars want 35.1 inches and also fit.
How many square feet is a 11 by 11 foot spare bedroom?
121 square feet of layout surface. The room needs considerably more than that, because you have to reach the back of the table and walk around it. Allow roughly two feet of aisle on each side you need access from, which for a table layout usually means doubling the footprint.
Is HO the right scale for this space?
It works. The 64 inch radius this space allows is above what ordinary HO freight equipment needs, so you are not fighting the space. Whether it is optimal depends on whether you want more railroad in the same area, which is the argument for going smaller.
What is the most common mistake on a layout this size?
Filling it with track. A small layout with too much track has nowhere for scenery, nothing that looks like a real place and very little to actually do, because every siding is too short to hold a useful train. One main line, one passing siding long enough for your longest train and two or three industries gives more operation and looks far better.
Should the layout have access from both sides?
If it is wider than about 30 inches, yes. Thirty inches is roughly how far most adults can reach comfortably, and track beyond that cannot be re-railed, cleaned or repaired without leaning on the scenery. A 132 inch table is past that, so plan access from both long sides or keep the far side free of track that needs attention.
Researched, not professional advice. This page is compiled from published manufacturer specifications, instruction manuals, published NMRA standards and recommended practices, and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are hobby convention rather than a standard, and they are labelled that way wherever they appear. Always check a radius, a clearance or a grade against your own equipment before you cut wood or lay rail, because manufacturers vary and so does what your specific models will tolerate. Any permanent mains wiring in a layout room is work for a licensed electrician to your local code.