I answer myself.
I asked this question to DTG and this is their answer (in case it might be of interest to anyone).
"Steam does allow the player to disable certain DLCs, but not that which is part of the core game including Baker loo Line, Sand patch Grade and Aachen to Koln.
To manage your DLC:
Open Steam, Library
Navigate to Train Sim World 2
Right-click, Manage, Properties, DLC
Untick desired DLCs.
Re-tick to install.
Please do not disable anything you do not recognise as they may contain vital assets for the base game".
So, after purchasing "Rush Hour" (in summer), everyone can decide which of the three routes to install.
Unlikely. The whole Rush Hour DLC will be one big box, you either get it all or none of it. Source: None. Semi-educated guess of mine.
No. You don't get what I'm saying. You're wrong.
"Improbabile. L'intero DLC di Rush Hour sarà una grande scatola, puoi comprarlo tutto o niente. Fonte: nessuno. Una mia ipotesi semi-istruita."
I don't think Rush Hour contains TSW Core, since TSW 2 is required.
Boh, we'll see.
I'm not saying it contains core.
I say it's one big DLC box. You can select it whole or nothing, but not the individual routes.
My hope would be as "Standard download size reduction" is on DTG's roadmap and after this has been implemented in the future we can choose on which routes to install. So to the discussion above, i don't see this coming with Rush Hour but as a general update so in the future there might be options to install only what you would want. At least if I understand that point from DTG correctly, it might mean something else.
