Old Prof wrote:!!jabber!!
After buying a few new-to-me DLC items from the summer sale catalog, I wandered over to Steam Workshop to look for additional scenarios featuring my freshly acquired routes and rolling stock. By making use of the sorting column, I found several scenarios that sounded interesting and subscribed to them. As I later selected one within TS, I discovered that in addition to one or more of the items I had just purchased, it also required a DLC that I didn't yet own. Of course, I would have known this immediately if the SW clearly listed all required DLC, but that's actually the point, isn't it? SW + DLC + seasonal or weekly markdowns = vicious circle of temptation. Now, that's a clever bit of marketing!

Yep, same thing happened to me, and what's worse is that I actually own some of the missing DLC, but it's owned under my son's Steam account. That's the thing that annoys me the most. I started collecting DLC on that account, but when he wanted to play something else at the same time as I was working on my models (and needed to login to Steam. on another computer of course, to use the Asset Editor), I couldn't, because he was already logged in. So I made a new account for myself, bought RW again (yes, I paid for TS2013 twice), and now I buy DLC on that account so that my son and I can both be doing our own things (me RW, him Team Fortress 2 or whatever) at the same time. The catch, however, is that much of my early DLC, like HSC, is tied to his account and there's no way to transfer it to mine (goes against the Steam EULA). So I've even had to buy the same DLC again! Now there's a clever bit of marketing for you. Make each person in the same household buy the DLC separately, even when only one of them will be using it at a time!! Gotta love Steam.
Anyway, I feel for you. I was going to play someone's scenario they made with the Connie, but although I have all the DLC required, half of it is tied to one account and half to the other, so I can't play the scenario under either of the two accounts.
