Ben, I checked a few ORERs and came up with this:

PRR 648314-648338 (K7)
7/50: 15
4/52-7/52: 3 (as 648317-648326)
1/53: 1 (as 648326)
4/53: 0

PRR 134079-135499 (K7a)
10/63: 3
1/67-4/67: 3 (as 134647-135076)
7/67: 0

PRR 128079-129078 (K8)
10/63: 2
1/67-4/67: 1 (as 128918)
7/67: 0

Ian Cranstone
Osgoode, Ontario, Canada
lamontc@...