Its no surprise the Comet 3s were retired. Various systems of the car were VERY unreliable. Also, does "Bradley Beach" ring a bell?
Anyway, NJT rebuilt the C2s. That "simple" project turned into quite a project. And the cars still have issues 10 years after coming back from rebuild. The Comet 4s are still some of the best cars in the fleet, but they are getting long in the tooth too. So the question comes, how should (and if) the Comet 3s and 4s are rebuilt, how should they be done? Rebuilt as Comet 4s with similar systems, kind of silly to rebuild the cars with nearly 20 year old technology. The Comet 2s were rebuilt with only 5 or so year technology. So that comparison is a whole other animal...it made sense at the time, espeically with the condition of the C2s before rebuild.
When/if the C4s (and maybe the C3s, who knows) are to be rebuilt, they are going to be stripped to the shells anyway (more than likely, id assume). Thats how the Comet 2s were rebuilt. They were simply a frame and walls. If indeed it is found that it would be cheaper, or only slightly more expensive to get new cars, which would be the proper direction to go?
If it would cost you $20,000 to rebuild from the ground up, your 1987 Ford Taurus with 290,000 miles, or buy a new 2012 Ford Taurus for $25,000, which would you do?
The same argument can be made for the '44s. But we have had this discussion more times than i can count....