Editing X 2000 (section)

==Speed==
[[File:SJ X2 in snow Jonsered 2007-01.jpg|thumb| X&nbsp;2000 passing through [[Jonsered]] in January 2007|left]]
The train's designated top speed is {{convert|210|km/h|0|abbr=on}}. It reached {{convert|276|km/h|0|abbr=on}} during a trial run with double power car units in 1993. The maximum speed allowed in regular traffic is {{convert|200|km/h|abbr=on|round=5}} for safety reasons – the signalling system (and systems like the [[overhead lines|catenary]]) are not built for higher speeds, and it shares the track with regular trains (like in most countries); also, most of the lines it uses were built in the mid-to-late 19th century. The 19th century railways Stockholm–Gothenburg/Malmö are relatively straight, since they were planned the shortest way without taking intermediate cities into account, and the landscape is relatively flat. Other 19th-century railways are generally curvier.

In comparison to other high-speed trains, the X&nbsp;2000 is not particularly fast; but compared to regular train services, it cuts journey time by about 10–15% – enough to make it competitive with airlines on many routes. It typically averages about {{convert|150|km/h|abbr=on|round=5}}. The fastest part is [[Katrineholm]]–[[Skövde]], a distance of {{convert|180|km|mi|abbr=on}} that is covered in 1 hour and 2 minutes, resulting in an average speed of {{convert|174.2|km/h|0|abbr=on}}.

SJ considered configuring the trainset with a sixth trailing car and creating a set of 12 trailer cars using a second locomotive. The trainset can stop in {{convert|1.1|km|mi|abbr=off}} from a top speed of {{convert|200|km/h|abbr=on|round=5}}.<ref>{{Cite web|url=https://railroads.dot.gov/sites/fra.dot.gov/files/fra_net/16313/1990_SAFETY%20RELEVANT%20OBSERVATIONS%20ON%20THE%20X2000%20TRAIN%20AS.PDF|title=Safety relevant observations on the X2000 train as developed for the Swedish National Railways|publisher=U.S. Department of Transportation. Federal Railroad Administration|date=1990|access-date=2022-05-20}}</ref>