Having not seen the numbers and lacking any real knowledge on the subject it's hard to comment but in theory, you sell the old fleet either as one package or to multiple municipalties, you replace the entire fleet from one vendor, which inturn should lead to a cheaper price per car and then you stick with one type until they are ready to be replaced, adding cars from the same type or model as needed.
This may cost a little more then utilizing cars that are 3 or 4 generations old but the benefits would definitely be there.
Unless you're saying that manufacturers replace their cars with new, uncompatitible models (ex. radical differences like door positions) on a very frequent basis, which would suprise me but if thats the case then I guess you're right, it's not on an option.
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