Originally Posted by
GUWonder
That strike by DSB employees disrupted all Oresundstag passengers trains between Denmark and Sweden (including in the opposite direction) at the time too.
Yes, that's correct. Traditionally, trains were operated by national train companies, one in each country, and on an international train the crew would change at the border, either at the last station before the border or at the first station after the border. Things have started to change and many international trains now run without a change of crew at the border, but the old tradition is still followed on some trains.
Öresundståg/Øresundstog crew changes near the border, either in Malmö Central or in Copenhagen. The Danish crew works for DSB and was obviously striking, and it seems that they decided to cancel all trains between Malmö and Copenhagen instead of running half of them with Swedish crew.
The Danish brand Øresundstog has officially been dropped by DSB; the trains are now referred to as regular regional trains (DSB Re) within Denmark. However, they are still officially called Öresundståg in Sweden.
SJ's trains between Copenhagen and Stockholm only use Swedish crew and so were presumably unaffected. The trains between Copenhagen and Hamburg change between Danish crew and German crew at Puttgarden in Germany and so presumably weren't running between Copenhagen and Puttgarden.