SL Cx
| SL Cx | |
|---|---|
Cx train at Akalla station | |
Interior of a Cx carriage in 2022 | |
| In service | 1950–2024 |
| Manufacturer | ASEA, Hägglund & Söner, Svenska Järnvägsverkstäderna (ASJ) |
| Family name | Cx |
| Constructed | 1949–1989 |
| Entered service | 1950 |
| Scrapped | 1980s–2024 |
| Number built | Over 800 |
| Number in service | 0 (since 2024) |
| Number preserved | 17 |
| Successor | SL C20, SL C30 |
| Formation | Single cars, typically 6- or 8-car trains |
| Operators | Storstockholms Lokaltrafik (SL) |
| Depots | Hammarby, Högdalen, Vällingby, Norsborg, Nyboda, Rissne |
| Lines served | Green line Red line Blue line |
| Specifications | |
| Car body construction | Steel Aluminium (C5) |
| Train length | 8-car train: approx. 140 m |
| Car length | 17,300–17,620 mm |
| Width | 2,700–2,800 mm |
| Height | 3,670–3,780 mm |
| Maximum speed | 80–90 km/h |
| Weight | 25–30 t per car |
| Traction system | DC motors, later chopper (thyristor) control on some types |
| Power output | 324–440 kW per car |
| Electric system(s) | 650–750 V DC third rail |
| Current collector(s) | Contact shoe |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) |
The SL Cx series is the collective designation for the C1–C15 types of metro trains used on the Stockholm Metro from 1950 until 2024.
Over 800 Cx cars were built in total. They were manufactured by ASEA, Hägglund & Söner, and Svenska Järnvägsverkstäderna (ASJ), and underwent significant technical development during their production span.
The cars were typically operated in 6 or 8-car formations, which constituted a full-length train of approximately 140 metres. The Cx cars were designed for interoperability, and most types could be freely mixed within a train.
The Cx series formed the entirety of Stockholm’s metro fleet from its inception until the introduction of the C20 units in 1997. The last Cx units were withdrawn from service on the metro in February 2024, following the introduction of the C30 units in 2020. As of 2025, some converted Cx units remain in operation on Saltsjöbanan suburban railway.