CP 9300-9303, 6000 HP models... 50% of the fleet failed due to catastrophic crankshaft failure. CP 9100's, 4300 HP models, kept close to home shop Winnepeg, MB account high road failure rate, in particular traction motor faults/failures that cause the entire truck to go off line (all 3 axles) 50% loss of power and 100% loss of Dynamic Brake. GE's AC4400's by comparison lose only the faulty traction motor (1 axle) allowing the unit to operate normally in power and Dynamic Brake, at a reduced rate of 16% of maximum. So as long as a train's tonnage is not at max rating or higher, a GE traction motor failure won't cripple a train whereas a train with an SD90 TM failure will be in trouble, requiring another locomotive, a siding to park the train while another unit is sent out, and most likely, a recrew.
Unofficial word is CP, a long time EMD customer (SD60's, SD40's, & GP38's), will not buy another EMD product because of the 90's poor record. GE's reliability and customer support have blown away EMD's, and the AC4400 is now the backbone of CP's locomotive fleet. The AC4400 model is the first GE locomotive CP has ever had experience with (except for a token of U boats for the SOO Line 30 years ago), they've proven themselves, and since AC traction is the way to go, EMD is, unfortunately for the new owners ..." OUTTA THERE!!!"