from what I know SEH which you got with TSW3 and LGV which you might've got for free from Focus' "takeover" (didn't see much happening yet) so it's quite a bit useless and also too expensive then but uhh yeah idk
to add to this, Left Rhine Line, Southeastern Highspeed, Boston-Providence and LGV Mediterranee won't be included in Deluxe Edition, if you don't have interests in these routes or already have them then you don't need the Special Edition and can either buy Deluxe if you still want soundtrack/wallpapers/FlyingScotsman/Vectron/etc. or Standard for... well, less.
I really don't get what people DTG are trying to appeal to with this special edition. The vast majority of players coming from TSW3 will already have LGV & SEHS, so I don't see many existing players wanting it. And I don't see a $100 edition of a game having any appeal to anyone who already isn't in the TS ecosystem.
