As per Wikia's guidlines, you must be 13 years or older to make an account here. If anyone is found to be under the age limit, they will be banned.
No cussing, swearing, obscene language, or profanity of any sort. (Even if it's abbreviated!)
No "mature references", for want of a better word.
No dissing anyone. (Including yourself.)
No saying "Thomas is for babies" or anything like that. It's not, it's for everyone.
Do not edit just for the sake of editing. Just because you have more edits or badges than another user, that doesn't mean you are more important than they are.
Only edit your own user page, not anyone else's. (Unless you get permission from the other user first.)
Sarcastic attitudes, unless properly executed, are not accepted. (An example of badly executed sarcasm: "Don't know me? Then too bad. I'm not worth looking up.")
Don't mini-mod. If you see a user breaking a rule, don't tell him, tell an admin and they will take care of it.
Multiple accounts are not allowed. If you make a second account after being banned, you will be found out and the duplicate account(s) will be banned forever.
Please don't harass or aggravate spammers and vandals as it only incites them to cause more damage.
And absolutely no vandalism!
This could be considered a "catch all" rule, but for the sake of it will be included separately: Be kind and respect all other users. Especially admins who have the authority to block anyone who gets out of line.
Don't answer to messages left for someone else. It doesn't matter what the reason is.
Do not put a message on your own wall. Leaving a message on your own wall is considered spam as doing so, is not talking to another person.
Edits are not usually undone on this wiki. Just in case however, please do not complain to admin when your edits are undone by a user. Expect your edits to be rolled back or further tweaked. That's usually how the majority of Thomas and Friends related wikis work.