Exactly, they still have codal life left. And will continue to work for quite some time. Even Marudhar and PNBE-KOTA used to get WAG7s regularly a year or two back.
About WAM-4, I don't think they're in use now. A few were used inside GZB, CNB, ASN sheds and Uslapur Training Center some time ago. Although ASN converted a couple to WAS series, I suppose.