Train Sim World® 3: Standard Edition (90%)(HL)(game + 3 DLC)($3.99)

Train Sim World® 3: Standard Edition
https://store.steampowered.com/sub/749139/

Includes the following content
Game -Train Sim World® 3
https://store.steampowered.com/app/1944790/Train_Sim_World_3/

DLC - Train Sim World® 3: Cajon Pass: Barstow - San Bernardino Route Add-On
https://store.steampowered.com/app/1998963/Train_Sim_World_3_Cajon_Pass_Barstow__San_Bernardino_Route_AddOn/

DLC - Train Sim World® 3: Schnellfahrstrecke Kassel - Würzburg Route Add-On
https://store.steampowered.com/app/1998962/Train_Sim_World_3_Schnellfahrstrecke_Kassel__Wrzburg_Route_AddOn/

DLC - Train Sim World® 3: Southeastern Highspeed: London St Pancras – Ashford Intl & Faversham Route Add-On
https://store.steampowered.com/app/1998964/Train_Sim_World_3_Southeastern_Highspeed_London_St_Pancras__Ashford_Intl__Faversham_Route_AddOn/

Although Train Sim World® 4 is now available (and is 80% off) I consider it to be a good deal, because with the normal removal of games from Steam it is a matter of time before they are removed.

Additional notes: in four years, 3 games in this saga have been released and once the new game is released, the previous one is no longer updated. and Train Sim World 2 is still available so there is nothing that suggests the possible elimination of this game.

Away from the main offer
This game will be removed from steam soon (it's been in early access for 6 years) and it costs $.99
https://store.steampowered.com/app/989210/PsyShift/