Regular Type-E (no shelves) coupler on BNSF GE Dash-8 locomotive, taken inside their Galesburg shop in 2014
AAR Type-F tight-lock coupler on BNSF GE ES44C4 locomotive, taken at Galesburg in 2015
AAR Type-H tight-lock coupler on Amtrak passenger car, taken at Galesburg in 2015
Remember that all these couplers are compatible with each other on real modern trains. So, a BNSF locomotive with Type-E or Type-F coupler could be coupled to any freight car or passenger train, if needed or any such combinations. So, the intent would be to just capture the looks of the modern shelf-coupler in O-Scale, while being compatible with existing Kadee or Atlas-O couplers.
These are just my opinion.
Thanks,
Naveen Rajan