Between 1988 and 2007, 3112 saw most of its work with 3801 Limited, attending the annual Hunter Valley Steamfest at Maitland and Thirlmere’s Festival of Steam, as well as running enthusiast specials to Kiama, Gosford, Moss Vale and other locations in the Sydney Area, during which it was sometimes paired with C38 class locomotives 3801 and 3830.
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In 1988, it attended the Aus Steam '88 event in Melbourne, travelling south in the company of recently restored Z12 class locomotive 1210.
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On another occasion, 3112 was one of three locomotives selected to run a triple-headed excursion from Maitland to Sydney with the return run from the Hunter Valley Steamfest.
Seventy cars were introduced into service between 1987 and 1996 with the first 20 built by Comeng between 1987 and 1989 numbered #3001-#3008 and #3101-#3112, and the remaining 50 built by Clyde Engineering between 1992 and 1996 numbered #3009-#3030 and #3113-#3140.