If the CD key hassle becomes unbearable, consider moving on to modern equivalents:
These modern versions cost $30–$70, but they include the Download Station access, regular updates, and no need to hunt for obsolete builds. trainz simulator 12 build 46957 cd key
You can find used DVD copies of TS12 on eBay or Amazon Marketplace. However, be warned: If the previous owner already registered the CD key to their MyTrainz account, you cannot register it again. You will own the disc but have no access to online features. Only buy "sealed" or "new" old stock. If the CD key hassle becomes unbearable, consider
Do not use or seek keys from unauthorized key-sharing sites, torrents, or forums offering “free” keys—those are illegal, may be revoked, and often carry malware or scams. These modern versions cost $30–$70, but they include