Purchasing a Private Car membership is easy. Visit Trainz.com and sign in, then click on the Rewards section of the top menu, and choose About Private Car.
Click on Add to Cart next.
From there, click the Check Out button.
The last step is to click the checkbox, acknowledging that you are subscribing. Once that's checked, click Pay now and enter your usual payment information.
That's it! If you ever need to cancel, contact customer service and provide the email address you used to sign up.