| GWR 3511 to 3520 |
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| Type and origin |
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| Power type | Steam |
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| Designer | William Dean |
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| Builder | GWR Swindon |
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| Order number | 64 (part) |
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| Serial number | 1016–1025 |
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| Build date | 1885 |
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| Total produced | 10 |
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| Specifications |
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Configuration:
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| • Whyte | 2-4-0T |
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| • UIC | 1B |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 3 ft 7 in (1.092 m) |
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| Driver dia. | 5 ft 1 in (1.549 m) |
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| Wheelbase | 17 ft 0 in (5.182 m) |
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| Fuel type | Coal |
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| Heating surface: | |
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| • Firebox | 103.29 sq ft (9.596 m2) |
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| • Tubes | 1,106.57 sq ft (102.804 m2) |
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| • Total surface | 1,209.86 sq ft (112.400 m2) |
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| Superheater | None |
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| Cylinders | Two, inside |
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| Cylinder size | 17 in × 26 in (432 mm × 660 mm) |
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| Valve gear | Stephenson |
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| Train heating | Steam |
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The GWR 3511 class were standard gauge 2-4-0T locomotives designed by William Dean for the Great Western Railway and built in 1885.