Dovetail Games re-releases the same train simulator game every year, with only ever so slight changes.
Be aware that this is - as the name would suggest - a simulator, not so much a game. Don't expect any innovative gameplay elements, but a focus on simulating conducting a train.
This is their second Humble Bundle focused on the Train Sim World franchise after the "Train Sim World 3 Mega Haul" Bundle which was on sale from june 28 to july 20, 2023.
Most of the DLC is recycled from the older titles, too, but was not part of last years TSW3 bundle.
Nonetheless, this bundle offer a good value for money, IMHO, with the ammount of DLC it comes with.
To Dovetails credit, their DLC is cross compatible accross Train Sim World 2, 3 and 4, which means that if you bought last years bundle, you can enjoy your old DLC in the new game, and the new DLC in the old game.