If your original contract did not include you to train your replacement, I would not do it. I typically work to my contract's scope, and if trainng is not part of that scope, then I decline politely.
It's no different than if they hired you as a mechanical engineer, and then asked you to do some electrical transformer design (assuming you have the skills). The contract is the governing document. If it's not in the contract, then it is not in the contract. If nothing else, my rates are different for what I do.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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