Even with SCR, the reason for rejecting was more about convenience. LGD already has a sizeable fleet of WAG9 locos. And, other than the gear ratio and software changes, WAP7 is nothing but a white WAG9 :P . So, adding WAP7's would not cost them anything as there is no infrastructure change needed. Whereas adding WAP5's needs quite a lot of infrastructure changes. I hope sheds which are still not in the 3 phaser list, like BZA and AJJ get to home WAP5's.