We had a similar situation arise in our family last year.
First thing we did was look at the triggers. For my son it was frustration and powerlessness at being the youngest child among a bunch of older playmates.
Second thing we did was find language to talk about biting that avoided all 'don't' and 'shouldn't' type language. Instead we said, "Biting hurts. Use your words," or "Show me your gentle hands" or similar type things. Why? Because there are instances, though rare, when biting might be appropriate (think of all the predators who might take advantage of a child) and I want biting to be an available behaviour in cases of self-defense. Whether that's 'proper' in society's terms or not I really don't care.

I want my child to retain his/her personal soveriegnty.
Third thing we did was warn the other kids that "last time he felt like you were bossing him around he bit you, remember?" just so they would be mindful of the patterns of their own behaviour.
Perhaps our situation was different to yours. The scenario in which he bit was really clear-cut and easy to prevent. As soon as his language ability passed a milestone he was able to express himself better and the biting behaviour subsided.
I also find that sticking to specific "yes" statements in the past tense can help them through the hurt and anger very quickly. eg "You didn't like it when (name) took the train away. Did you feel angry?" etc. If they're able to express themselves, even in one word sentences then it's good to give them the opportunity to express themselves.
I look forward to reading other replies.