The Swedish rail news site jarnvagar.nu published an interesting article recently about SJ's plans for the west coast. https://jarnvagar.nu/fler-snabbtag-pa-vastkustbanan/
Currently there are a couple of large construction projects happening on the West coast line. In the south, the line is being expanded from two to four tracks between Malmö and Lund, which will open later this year. A bit further north most of the single track portion from Helsingborg to Ängelholm will be replaced by a new double track next year. There is also a tunnel being built under Varberg that will open in 2025. And in Gothenburg the tunnel project Västlänken was set to open in 2026 but will probably be delayed. Add new high speed trains to that and things will happen in a few years.
The Varberg tunnel and the double track south of Ängelholm is expected to reduce the travel time between Malmö and Gothenburg by 20 minutes. SJ will use that to increase the number of departures along the west coast. For the moment with X55/SJ 3000 most of the year and X2000s in the summer. The big change will come in 2027 when SJs new high speed trains are delivered. SJ plans to use them on the west coast with three daily trains Oslo-Gothenburg-Copenhagen and seven daily additional trains Gothenburg-Copenhagen, all using the new trains.
A plan for Oslo-Gothenburg-Copenhagen-Hamburg trains have also been mentioned here and the article also mentions the plan to use DSB's Talgo trains for the route, although that would require new locos that can haul the trains in Sweden and Norway as DSB's Vectrons are not equipped to run in Sweden and Norway.
Currently there are a couple of large construction projects happening on the West coast line. In the south, the line is being expanded from two to four tracks between Malmö and Lund, which will open later this year. A bit further north most of the single track portion from Helsingborg to Ängelholm will be replaced by a new double track next year. There is also a tunnel being built under Varberg that will open in 2025. And in Gothenburg the tunnel project Västlänken was set to open in 2026 but will probably be delayed. Add new high speed trains to that and things will happen in a few years.
The Varberg tunnel and the double track south of Ängelholm is expected to reduce the travel time between Malmö and Gothenburg by 20 minutes. SJ will use that to increase the number of departures along the west coast. For the moment with X55/SJ 3000 most of the year and X2000s in the summer. The big change will come in 2027 when SJs new high speed trains are delivered. SJ plans to use them on the west coast with three daily trains Oslo-Gothenburg-Copenhagen and seven daily additional trains Gothenburg-Copenhagen, all using the new trains.
A plan for Oslo-Gothenburg-Copenhagen-Hamburg trains have also been mentioned here and the article also mentions the plan to use DSB's Talgo trains for the route, although that would require new locos that can haul the trains in Sweden and Norway as DSB's Vectrons are not equipped to run in Sweden and Norway.