Well, I only picked the sheds with a relatively larger number of WAP7 locos. BRC, TATA, WAT have only recently got these locos and none of them more than 15 locos, and haven't started working extensively across zones like the big 5 do. Counting the number of WAP7 failures for these sheds would not really yield any meaningful data. They have very few, very new locos so it does not hold up for a comparison. For the same reasons I haven't included BIA and AQ as well, as they have too few locos to yield any meaningful comparison.
I was going to compile WAP5 and WAG9 data as well, but this post was mainly about WAP7 locos...
more... and in addition, only GZB and BRC hold the P5's for now, so didn't include that here.