Your search for a CD key depends on your purchase method:

: The key is typically found on a sticker on the back of the manual or inside the CD case. Tips for Registration

If you purchased TS12 via Steam, the platform stores your key internally. Open your Steam . Right-click on Trainz Simulator 12 . Select Manage and click on CD Keys . The Risks of Using Unauthorized Serial Keys

If you have the original DVD, the sticker is usually located on the back of the manual or inside the case under the disc tray. Why Avoid "Free" Serial Keys and Keygens?

In the flickering glow of a basement monitor in 2011, Elias stared at the "Insert Serial Key" prompt for Trainz Simulator 12

Experience Trainz on the move with customized controls.

The number is a specific Build Number for Trainz Simulator 12 . In software development, a build number is an internal identifier for a particular version of the game's code. For TS12, 46957 corresponds to the original, unpatched retail version of the game. It's a key part of the game's version history: