During these years, i bought all locos and routes which now belong to Preserved Collection for TSW 2. But can i play with these in TSW 2 without to have installed Train sim world 2020 on my Xbox One?
Yes everything should now be available in TSW2. You will need to install TSW2 versions, which should be available free if you bought TSW2020/TSW1 versions. You can uninstall TSW2020 if you are finished with that but Northeast Corridor and it's associated locos will not work in TSW2.
I have this issue i can access everything except what came with the disk of Train Sim World 2020. When i try to download the preserved collection from TSW2020 to TSW2 it asks me to buy them again.
If you have disc copies of tsw/tsw 2020 you have to submit a ticket to redeem those dlc. Remember its the holidays now, and customer support is closed until 4th january. ( happy be corrected if wrong)