Nr II is a class of articulated six-axle (B′2′B′

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

), chopper-driven

tram A tram (also known as a streetcar or trolley in Canada and the United States) is an urban rail transit in which Rolling stock, vehicles, whether individual railcars or multiple-unit trains, run on tramway tracks on urban public streets; some ...

operated by

Helsinki City Transport Helsinki City Transport or HKL ( Finnish: ''Helsingin kaupungin liikennelaitos'', Swedish: ''Helsingfors stads trafikverk'', abbreviated to ''HST'') was the official city-owned public transport company in Helsinki, Finland. It operates the Hels ...

(HKL) on the

Helsinki tram network Trams in Helsinki form part of the public transport system organised by Helsinki Regional Transport Authority and operated by Metropolitan Area Transport Ltd (, ) in Finland's capital city of Helsinki. The trams are the main means of transport ...

. All trams of this type were built by the Finnish metal industry corporation

Valmet Valmet Oyj, a Finnish company, is a developer and supplier of process technologies, automation systems and services for the pulp, paper, energy industries. Flow control serves a wider base of process industries. History 1999–2012 Valmet ...

between the years 1983 and 1987. Between 1996 and 2005 all trams in the class were modernised by HKL and redesignated as Nr II+ class. From 2006‒2011, all trams of this class were rebuilt with a low-floor midsection and redesignated as MLNRV II.

History

The Nr II class was a further development of the Nr I class built by Valmet for the HKL between 1973 and 1975 (the Nr I was in turn based on the popular

Duewag Düwag or Duewag (stylised in all caps), formerly Waggonfabrik Uerdingen, was a German manufacturer of rail vehicles. It was sold in 1999 to Siemens with the brand later retired. History Duewag was founded in March 1898 as Waggonfabrik U ...

-built GT6 class). The Nr I and Nr II classes are virtually identical in their exterior and interior designs, with exception of the tail lights. The first three Nr II class trams were delivered to

(HKL) in 1983, followed by an additional 11 in both 1984 and 1985, further ten in 1986, and the final seven in 1987. The first tram in the class entered service for HKL in July 1983. Between 1996 and 2005, all trams in this class were modernised with updates to the technics, changes to the interior layout, addition of electronic displays displaying the name of the next stop, as well as replacement of the original seats with new ones. Following the modernisation, the class was re-designated as Nr II+. Between 2004 and 2007, all trams in the class were built with new line displays in the front and side of the tram, displaying both the number and destination on the line. In 2006, tram number 80 was rebuilt with a new low-floor midsection, built by Verkehrs Industrie Systeme. As a result of the lengthening, the tram has a B′2′2′B′ wheel arrangement, and can accommodate 30 additional passengers. To cope with the added weight of the midsection, the output of the traction motors was increased by approximately 20%. Experiences with the prototype lengthened tram were positive, and the rest of the Nr II class were similarly rebuilt from 2008 until 2011.

Accidents

On July 21, 2003, one of the Nr II-class trams derailed at high speed in the junction between Mannerheimintie and Aleksanterinkatu in central Helsinki, and collided with a

motorcycle A motorcycle (motorbike, bike; uni (if one-wheeled); trike (if three-wheeled); quad (if four-wheeled)) is a lightweight private 1-to-2 passenger personal motor vehicle Steering, steered by a Motorcycle handlebar, handlebar from a saddle-style ...

, which resulted in the death of the motorcyclist. An investigation into the causes of the accident revealed that the driver of the tram had lost consciousness shortly before the collision due to extreme heat in the

cockpit A cockpit or flight deck is the area, on the front part of an aircraft, spacecraft, or submersible, from which a pilot controls the vehicle. The cockpit of an aircraft contains flight instruments on an instrument panel, and the controls th ...

of the tram. In 2005, as a result of the accident, HKL redesigned the windshield of three Nr II class trams, adding a large vizor that contains an air conditioning unit, which also shields the driver from direct sunlight. The visors were later removed and the original windshield restored.

Future

The Nr II class are expected to remain in service at least until 2030.

Liveries

Like the Nr I class, the first Nr II class trams were originally painted in an orange/grey colour scheme. In 1986 HKL abandoned the unpopular colour scheme, and from tram number 104 onwards the Nr II class trams were delivered in HKL's traditional green/yellow livery. By 1995 all units in the class had been repainted in the classic livery.

References

External links