The 197 cars were built by Strømmens Verksted, Norsk Elektrisk & Brown Boveri and AEG between 1960 and 1981.

Each car was equipped with a driver's cab at one or both ends and four motors, each with 98 kilowatts (131 horsepower).

In 1960, two less powerful T single-car units were built, designed to be prototypes used on the Oslo Tramway.

After a one-year trial, they were put into scheduled traffic to the Kolsås Line, where they remained in regular service until 1983.

The T1300 was a series of 33 new and sixteen rebuilt T4 trains equipped with pantographs which previously allowed them operate on the western part of the network, prior to it being upgraded to third-rail metro standards.

[5] The need for new rolling stock on the western suburban tramways prompted Oslo Sporveier to order a modified version to the T1000.

The T1300 units were built with the same specifications as the T1000, but were also equipped with pantographs so they could operate on the light rail lines.

With the introduction of the T1300, the western lines could remove the conductor and have single-manned trains with the motorman selling tickets.

However, because they are designed for a closed system with automatic train protection, the braking systems are not sufficiently dimensioned for when the drivers use line of sight to regulate the speed and distances between trains.

[8] The Sognsvann Line was finished upgraded to metro standard on 7 January 1993, allowing the first T1000 trains to operate through the Common Tunnel into the western network, converting parts of the Oslo Tramway to metro.

The Røa Line was finished on 19 November 1995, allowing all trains from the east to operate through the city center.

To have sufficient metro-compatible trains, six two-car T2000 units were bought, and during the mid-1990s were considered to be a possible replacement for the T1000s.

Starting in 1995, Oslo Sporveier made an interior and livery upgrade to the T1000 trains.

The main red color to the exterior was kept, but the doors and around the windows were painted blue.

The interior walls were painted red at the end, white on the sides, blue on the doors and received yellow hand bars.

[9] Oslo City Council decided in 2003 to order 33 new three-car units from Siemens, that would be designated MX3000.

[10] In 2005, the city council voted to replace all existing T1000 and T1300 stock with the MX3000, increasing the order by another 30 units.

They are each equipped with four 98-kilowatt (131 hp) motors from NEBB, giving a maximum speed of 70 km/h (43 mph).

The speed codes are transferred from the ATP points in the infrastructure, using 75 hertz pulses in the tracks.

[16] All models are capable of operating six cars in multiple, although they are commonly used in shorter configurations.