Unless otherwise stated in the asset config, our content is protected by Creative Commons BY-NC-ND License. Read it here: https://creativecommons.org/licenses/by-nc-nd/4.0/
Additionally, we have some general guidelines for good use.
1) You may modify any content in private. However, do not share modified content without first contacting the original author.
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4) Beta testing will be undertaken by whomsoever the author chooses. If additional testing is required, the author and/or the Trainz Forge team will notify the community via the Trainz Discussion Forums. Should you see an obvious error in a model, contact the author personally.