I downloaded the free training centre content on PS5 last week. Do you have to purchase the full version to play the add ons and other DLC?
Everything can be purchased separately. Just be aware some add ons, such as loco DLCs, will need another for you to be able to use them. The Pendolino, for example, can only be used on the West Coast Main Line route (although without that it will provide an unplayable "layer" on other appropriate routes)
Hello matt#3730 - Just to follow on from Jack's answer above, if you want to find more information on the Train Sim World 5 content specifically, including the routes/locos within the various bundles we released at launch, here's our FAQ page with more details: https://dovetailgames.freshdesk.com/support/solutions/articles/80001146733-train-sim-world-5-faq#What-Train-Sim-World-5-bundles-will-be-available-at-launch? You'll be able to find a full breakdown of what each version of TSW5 includes if you're interested in the newest add-ons, as well as any additional answers to questions you may have, and guidance for installing too! Hope this helps