It’s a lot of space, but these days apart from the train sims and Snowrunner I don’t play much else. Neuropathy and loss of motor function in my hands makes FPS or any form of intense KBM action very difficult.
Rudolf from Steamforum said: Route DLCs are about 5Gb, loco DLCs round 1-2Gb Newr DLC tend to require more disk space. In total I use about 100Gb at the moment. I own about 75% of all DLC.
Here's mine: Totals just under 60GB - a vase improvement on pre-Rush Hour, whereby this would've easily taken 100GB, probably much more. (note "LeipzigS2SBahn" is Rapid Transit, "NorthRhineMainLine" is Hauptstrecke Rhein Ruhr and "Wuppertal" is Rhein Ruhr Osten).
Plenty of information can be obtained from Steamdb.info without owning everything or having everything installed. Sizes of DLCs for example from the depots (hover on DLC in Extra column to see which DLC it is): https://steamdb.info/app/1282590/depots/ The current sizes are (sorry it isn't in a nicely looking table): Code: Name Max Size Train Sim World 2 Content 13.36 GiB Rush Hour – Nahverkehr Dresden Route Add-On 6.62 GiB Rush Hour - London Commuter Route Add-On 6.38 GiB Rush Hour - Boston Sprinter 5.01 GiB Sherman Hill: Cheyenne - Laramie Route Add-On 4.91 GiB Train Sim World 2 - DLC 51 4.68 GiB Northern Trans-Pennine: Manchester - Leeds Route Add-On 4.62 GiB Southeastern High Speed: London St Pancras - Faversham Route Add-On 4.36 GiB Hauptstrecke Hamburg - Lübeck Route Add-On 4.32 GiB Long Island Rail Road: New York - Hicksville Route Add-On 4.21 GiB Hauptstrecke München - Augsburg Route Add-On 4.20 GiB Rhein-Ruhr Osten: Wuppertal - Hagen Route Add-On 4.16 GiB Tees Valley Line: Darlington – Saltburn-by-the-Sea Route Add-On 4.04 GiB Great Western Express Route Add-On 3.95 GiB LGV Méditerranée: Marseille - Avignon Route Add-On 3.73 GiB Ruhr-Sieg Nord: Hagen - Finnentrop Route Add-On 3.63 GiB East Coastway: Brighton - Eastbourne & Seaford Route Add-On 3.62 GiB Rapid Transit Route Add-On 3.61 GiB Arosalinie: Chur - Arosa Route Add-On 3.59 GiB Peninsula Corridor: San Francisco - San Jose Route Add-On 3.54 GiB Clinchfield Railroad: Elkhorn - Dante Route Add-On 3.54 GiB Cane Creek: Thompson - Potash Route Add-On 3.50 GiB Main Spessart Bahn: Aschaffenburg - Gemünden Route Add-On 3.16 GiB West Cornwall Local: Penzance - St Austell & St Ives Route Add-On 3.11 GiB Scottish City Commuter: Glasgow - Newton & Neilston Route Add-On 2.98 GiB Hauptstrecke Rhein-Ruhr: Duisburg - Bochum Route Add-On 2.68 GiB Canadian National Oakville Subdivision: Hamilton - Oakville Route Add-On 2.34 GiB Isle Of Wight: Ryde - Shanklin Route Add-On 2.20 GiB West Somerset Railway Route Add-On 1.67 GiB Diesel Legends of the Great Western Add-On 426.06 MiB London Underground 1938 Stock EMU Loco Add-On 234.20 MiB Caltrain MP36PH-3C ‘Baby Bullet’ Loco Add-On 229.09 MiB DB BR 182 Loco Add-On 223.40 MiB BR Heavy Freight Pack Loco Add-On 221.90 MiB CSX C40-8W Loco Add-On 215.60 MiB DB BR 187 Loco Add-On 198.55 MiB DB BR 363 Loco Add-On 172.68 MiB DB BR 101 Loco Add-On 168.44 MiB Southern BR Class 313 EMU Add-On 151.18 MiB DB BR 155 Loco Add-On 146.52 MiB Southeastern BR Class 465 EMU 138.40 MiB BR Class 31 Loco Add-On 129.94 MiB BR Class 20 'Chopper' Loco Add-On 126.05 MiB LIRR M3 EMU Loco Add-On 121.99 MiB DB BR 204 Loco Add-On 117.45 MiB Caltrain MP15DC Diesel Switcher Loco Add-On 100.43 MiB BR Class 33 Loco Add-On 84.52 MiB BR Class 52 'Western' Loco Add-On 82.06 MiB