>>1745214Anon. We are not discussing whether railroads had the power to do or not do something. We are discussing what led them to make those decisions. Protip: they were not le-ebil. Try to keep up.
>>1745218They kind of do and kind of don't. You need to transfer the pulling forces from the bogies to the coupler and there are two ways of doing it. The first one is, what I gather from EMD/GE approach, is to have pin on which secondary frame is rotating, but to that frame a proper bogie is placed on some sort of suspending element in a form of 2nd stage suspension. This allows the bogie to float somewhat.
The other way is to make the bogie float fully ( sometimes even linking bogies in a daisy chain ) and connect them to the locomotive using a solid bar which pretty much forces the bogie to float. Pic-rel ( sorry for it being a model, its the best I could find ) is IORE class of swedish electrics and you can see a bar that links the bogie to the locomotive frame.
The advantage of the bar above the pin is that the bar avoids the pesky "one axle grips less than the other two" which tends to happen on triple axle bogies.
