I just started my conversion of my old Bachmann HO sets from the 80's. I'm going my CP Rail set first and i just finished converting the locomotive.
And i think the conversion worked out pretty nicely 

Before:


After:


Though switching trucks have been troublesome to say the least. A couple of lost springs that flung away and one truck with coupler which had the lid burst off and sent the spring and dowel flying into oblivion.
And i just found out i need to buy a different coupler for the Caboose, turns out that Kadee's conversion charts don't streach back far enough. According to it i needed 37's for all cabooses, but it turns out i am going to need 32's instead because of the higher elevation of the caboose.

This hobby can be tedious at times. 

I was just looking at one of the CP Rail GP35 loco's bachmann has, i cant seem to find any detailed information on it.
So does anyone know if the CP Rail GP35 diesel, product number: 61706 is a standard DC loco?

I just took and dug out my old CN and CP Rail bachmann sets that we bought when i lived in Canada(living in Sweden now) in the 80's after having been tucked away in the attic for years. Over the years many of the couplers have broken, and when looking for replacements i found that the old X2F Horn couplers have been replaced with knuckle couplers.
So the question is, how do i go about replacing the old X2F with modern knuckles? And which kind of knuckle couplers should i use? I see bachmann makes their own, but i have heard a lot of good about the Kadee couplers.