The Shao Shan 4 (SS4 improved) electric locomotive is one of the most powerful DC electric locomotives in China. Manufacturing began in the mid 1980's and the locomotives are widely used throughout most of China's electrified railways to this day.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam