The location of your serial number depends on how you acquired the game: Physical DVD Version
Build 46957 is an older version of TS12. If you are having trouble with your key, it is highly recommended to update to the final stable build (usually Build 61388 Trainz Simulator 12 Service Packs trainz simulator 12 build 46957 cd key
Build 46957 is the base version (V3.4). To improve stability and compatibility with newer assets, you should patch it to the latest supported builds: Trainz Service Packs - Auran The location of your serial number depends on