Valmet Nr I
| Nr I | |
|---|---|
An Nr I class tram at Hakaniemi in Helsinki | |
| In service | 1973–present |
| Manufacturer | Valmet |
| Built at | Valmet airplane factory, Tampere |
| Constructed | 1973–75 |
| Entered service | 1973 |
| Refurbished |
|
| Number built | 40 |
| Number in service | 10 |
| Fleet numbers | 31–70 |
| Capacity |
|
| Operators | Helsinki City Transport (HKL) |
| Lines served | All HKL tram lines |
| Specifications | |
| Car length | 20.10 m (65 ft 11+3⁄8 in) |
| Width | 2.3 m (7 ft 6+1⁄2 in) |
| Height | 3.7 m (12 ft 1+5⁄8 in) with pantograph down |
| Floor height | Approx. 0.91 m (2 ft 11+7⁄8 in) |
| Maximum speed | 60 km/h (37 mph) |
| Weight | 28 tonnes (27.6 long tons; 30.9 short tons) |
| Traction system | Electric |
| Traction motors | 2 × Strömberg GHCU / H6232 |
| Power output | 2 × 130 kW (170 hp) / 260 kW (350 hp) |
| Electric system(s) | 600 V DC overhead lines |
| Current collector(s) | Pantograph |
| Braking system(s) | Track / disc / electric |
| Track gauge | 1,000 mm (3 ft 3+3⁄8 in) metre gauge |
Nr I is a class of articulated six-axle (B′2′B′ wheel arrangement), chopper-driven tram operated by Helsinki City Transport on the Helsinki tram network. All trams of this type were built by the Finnish metal industry corporation Valmet between the years 1973 and 1975.
Between 1993 and 2004 all trams in the class were modernised by HKL and redesignated as Nr I+ class. Currently HKL classifies them as NRV I.