British Rail Class ES1
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| North Eastern Railways Class ES1 | |
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| NER No.1, Locomotion museum, Shildon | |
| Power type | Electric |
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| Builder | British Thomson-Houston, with mechanical parts sub-contracted to Brush, for North Eastern Railway |
| Build date | 1903-1904 (contract signed with builders on 15 December 1902) |
| Total production | 2 |
| Configuration | Bo+Bo |
| Gauge | 4 ft 81⁄2 in (1,435 mm) standard gauge |
| Wheel diameter | 3 ft 0 in (0.914 m) |
| Wheelbase | 27 ft 0 in (8.230 m) |
| Length | 37 ft 11 in (11.557 m) |
| Height | with pantograph lowered 12 ft 11 in (3.937 m); raised 15 ft 9 in (4.801 m) |
| Locomotive weight | 56 tons (51 tonnes) |
| Electric system(s) | 600–630 V DC |
| Current collection method | Third rail or pantograph |
| Traction motors | British Thomson-Houston, 4 off |
| Top speed | 27 mph (43 km/h) |
| Power output | 640 hp (477 kW) |
| Tractive effort | 25,000 lbf (111.2 kN) |
| Train heating | None |
| Career | North Eastern Railway London and North Eastern Railway British Railways |
| Number | NER: 1–2 LNER 1–2, later 6480–6481 BR: 26500–26501 |
| Axle load class | Route availability 2 |
| First run | 1905 |
| Retired | 1964 |
| Disposition | No.1 preserved, No.2 scrapped in 1966 |
British Rail Class ES1 was a class of two electric locomotives commissioned by the North Eastern Railway in 1902. They were of steeplecab design.
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