DBAG Class 481
| Company type | Electric multiple unit train series |
|---|---|
| Industry | Rail transport |
| Founded | 1993 (prototype models emerged) |
| Headquarters | Berlin , Germany |
| Products | Electric multiple unit trains for Berlin S-Bahn |
The DBAG Class 481/482 is an electric multiple unit train series designed for the Berlin S-Bahn to supersede the outdated pre-World War II rolling stock following German reunification in 1990. Prototype models emerged in 1993, and deliveries of the first production units commenced in January 1996.
History
By the year 1990, the Berlin S-Bahn's rolling stock had an average service life of approximately four decades, mainly comprising Classes 475, 476, and 477. While operators in West and East Berlin were introducing newer models—the Class 480 in the West and Class 485 in the East—the reunification created a need for a standardized fleet and unified operations. The arrival of 500 Class 481 quarter trains by 2004 significantly lowered the fleet’s average age to around six years.
Although early deployments faced technical difficulties, especially related to door mechanisms, the Class 481 trains demonstrated overall dependable performance. A notable failure took place on May 1, 2009, when a wheel defect at Kaulsdorf station exposed fundamental design shortcomings concerning wheel construction and brake dimensions. This incident led to a broad-scale replacement of wheelsets throughout the entire fleet. Limitations in repair facilities caused delays in maintenance activities, resulting in temporary train withdrawals and disruptions to scheduled services. By 2010, regulatory authorities withdrew operating licenses for roughly 100 units, exacerbating operational difficulties. Further mechanical problems during the winter of 2011 further diminished the number of trains available for service.
Starting in 2011, the Berlin S-Bahn initiated the rollout of the advanced ZBS train control system based on Eurobalises; this upgrade is being exclusively installed on Class 481 units with full implementation targeted by late 2016. Plans initially set to phase out older rolling stock by 2017 were deferred due to procurement delays for new Class 483/484 trains combined with rising demand from Berlin’s population growth, extending the operational lifespan of older models until at least 2023.
Vehicles
A single Class 481/482 set comprises two cars: a driving motor car (481) equipped with a cab and a non-driving trailer car (482), connected via an internal gangway to form a quarter-train. Three specific units (501/601 through 503/603) feature four cars linked by three gangways. Since driving cabs are required at both ends of a train, the shortest operational formation is a half-train consisting of four cars arranged as 481-482-482-481. Two half-trains coupled together create an eight-car Vollzug, representing the maximum train length. On certain lines such as S25, S26, S41, S42, S47, and S85, six-car configurations are also utilized.
The seating layout features pairs of seats arranged two by two with dedicated open spaces allocated for bicycles and wheelchair access. Regenerative braking systems contribute to approximately a 30% reduction in energy consumption across the network. Of the four bogies per two-car unit, three are powered. Interior fittings incorporate durable fabrics designed to resist vandalism.
Owing to their characteristic high-pitched startup sound produced by three-phase AC motors controlled with pulsed voltage, these trains have earned nicknames like "circular saws" or "flying alarms," which have been a source of noise complaints.
Depots
| Depot | Units |
|---|---|
| Berlin-Wannsee (BWSS1): | 001–033, 035–042, 044–350, 501/601–503/603 |
| Berlin-Grünau (BGAS1): | 481/482 034, 043, 351–494 |
Units assigned to Grünau and Wannsee depots share resources; consequently, mixed formations drawing from both depots are frequently observed.
Routes
The DBAG 481 is deployed across every Berlin S-Bahn route. Lines S1, S2, S25, S3, S5, S7, S75, and S9 rely solely on the 481 series for their operations. Additionally, the 481 regularly runs on the Ringbahn lines S41 and S42, where it is the only train type used during weekends, as well as being exclusively assigned to line S47.
See also
- HKL Class M200 – a derivative of the DBAG 481 utilized within the Helsinki Metro system in Finland