The primary difference between HO and S scale trains lies in their physical size, dictated by their respective scale ratios. S scale models are larger than HO scale models.
Understanding Model Train Scales
Model train scales represent the ratio of the size of the model to the size of the actual prototype train. A smaller ratio means the model is larger relative to the real train.
Key Differences: HO vs. S Scale
Here is a comparison of the main differences between HO and S scale model trains:
| Feature | HO Scale | S Scale |
|---|---|---|
| Scale Ratio | 1:87 | 1:64 |
| Size | Smaller | Larger |
| Space Required | Less | Slightly More |
| Performance | Standard | Often Better (due to weight/heft) |
| Availability | Very High | Moderate |
Detailed Comparison
Let's look closer at the key aspects differentiating these two popular scales:
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Scale Ratio and Size:
- HO Scale uses a 1:87 ratio, meaning the model is 1/87th the size of the real train.
- S Scale uses a 1:64 ratio, meaning the model is 1/64th the size of the real train.
This makes S scale models physically larger than their HO scale counterparts. An S scale model of a locomotive will be noticeably bigger and taller than the same locomotive modeled in HO scale.
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Space Requirements:
- HO scale layouts require less space due to the smaller size of the models.
- While S scale models are larger, it doesn't take up much more space than HO-scale for an equivalent amount of track length, according to proponents. However, curves will have a wider radius for a realistic appearance, and structures and scenery will also be larger, requiring a bit more area overall for a sprawling layout.
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Performance:
- Both scales can achieve excellent running performance.
- However, the larger size of S scale allows for more weight in the models. As mentioned in the reference, S scale does provide the heft needed in locomotives to make them run better. This added weight can translate to improved traction, smoother running, and greater pulling power, particularly valuable for longer trains or steep grades.
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Availability:
- HO scale is the most popular model railroad scale worldwide, leading to a vast selection of locomotives, rolling stock, track, buildings, and accessories from numerous manufacturers.
- S scale has a dedicated following but less overall commercial product availability compared to HO. Modelers in S scale may need to rely more on niche manufacturers, limited runs, or building models from kits or scratch.
In summary, S scale offers a larger, potentially better-performing model train experience without a significantly greater space penalty compared to HO, though product availability is more limited.
