Trainz Commuter Rail has some NJT stuff, though I don't know about AEM-7s...I think there are some ALP-46s though. In fact, the only AEM-7s I know of are Connyxy's, and she has removed them from her site, and jefff944, who did an Amtrak that's on the DLS. Perhaps you could ask his permission and reskin it.
Come to think of it, did NJT ever run AEM-7s? I think they ran (and still do run) ALP-44s.