Camster,next time you see one of the Guilford wide cabs up close,look at the trucks: only 1 brake shoe per axle,not on both sides of wheels. There is is your answer to why they are unpopular for switching. Not enough quick stopping power until you get used to them,like having power brakes & then going to standard units. They stop,sure but it takes some getting used to. I think this was a problem of the U-18s when MEC first got them in the mid 70s. You rarely ever see a "wide cab" "kicking cars at Rigby,if there is a GP-35 or regular GP-40 available. Best "accelerating unit I ever saw on Guilford,was about 5 or 6 years ago,when a "Danville Extra",with close to 50 cars for the SLR had to stop at the diamond for an SLR crew switching. Took off on the slight eastbound grade,over the diamond & was up to 15 mph(yard limit speed,and they had to stop soon,to back their cars into the interchange track) in no time. SLR guys were even impressed. Just ONE unit,SD-45 #681!! Bud