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Wonder if anyone can explain / identify the different tail engines; i.e. MD 11 vs. DC10 or just engine upgrade.... Thanks.

I think the difference between the front aircraft and the rear aircraft is that the rear aircraft does not have the tail engine installed.

David, Thanks. As I was wondering more about it and trying to look closer, it appears more than an engine is missing, though the fence position does seem mask it a bit upon initial glance.