This isn't a bug with the TSW game, but an admin failure by DTG's Marketing Department: I am posting this here, even though I know full well that nobody will read it, and despite it costing DTG lost sales..... that DTG will do nothing about this..... in short, I am flagging up that..... ..... there is no listing for M3 or Baby Bullet on the Playstation Store page for Train Sim World. You cannot see the LIRR M3 or the PC Baby Bullet listed under the TSW game page: - on the PlayStation Store internet page; - via the PS4 XMB menu under the Playstation Store icon; or - via the PS4 XMB menu from the TSW game icon. Please note that DTG is about to release the Class 20 - if this is listed using the same process as that used for the LIRR M3 and the PC Baby Bullet, then the Class 20 will not be visible via the three main channels that people use to view and buy DLC for games on PlayStation. This post is meant to be helpful...., but I really do wonder sometimes why I bother.....
Go to the icon for the TSW game in the PS4 menu. Scroll down to look at DLC. Look at all DLC. Do you see the M3 or MP36 (Baby Bullet) listed.... with all of the other DLC for the game?
I might be an an unusual or odd person, but I have never bought DLC for a game by using the in-game link. You can link to the individual entries for these two DLC via the in-game prompts, but they are not listed under TSW on the game page (with the other DLCs), however you choose to view them on PlayStation Store.