Today we have released a patch which fixes both issues of the recently published USA DLC as well as issues of the new mod system.
Most important, when running the USA DLC game mode, there was a bug which caused towns not to be completely American but mixed (all buildings, European and American, were enabled as a consequence of the bug). Furthermore, we have fixed a problem with the 2-8-2 Mikado Steam locomotive which caused the locomotive not to be available for purchase (as intended after 1898).
Because many players have requested that speed should also be displayable in “mph” instead of “km/h” we have added this feature (along with configurable units for power, weight and force).
In regard to the new mod system, we have fixed a number of issues as well. One issue was that the main menu mod list was not scrollable, which caused problems for players who wanted to activate a large number of mods. Another problem was that the displayed “active mod list” in the load game dialog was not correct (however note that the behavior was correct).
Finally, and probably most important to mention, deprecated mods are now directly recognized in Train Fever. Originally we planned that players use the available mod managers (TFGM and TFMM) to install / convert deprecated mods. However the plan failed because (a) some players install the mods manually and (b) in contrast to our plans one of the two available mod managers (TFMM) was unfortunately not updated yet, but was finally updated today.
Please find the release notes of the latest game update here.
To improve understanding of the new mod system we have set up a page which answers all frequently asked questions about mods here. The page explains how to use mods. At a later point in time we will also publish more information on how to create mods (specification of the new modding system).
Of course, we will update the game (and the USA DLC) also in future. Thanks for your continuing interest in Train Fever and best wishes!