Differnt types of couplers

[bjlavish]

What is the difference between bottom, Center and top shank couplers. The couplers I have on the passenger car keep hitting the switch tracks. What should I do

[jbrock27]

It is where the knuckle is in relation to the coupler shank: below, above, centered.

Is it the coupler or the little metal "hose" that hangs from it that is hitting the track?

[ACY]

Your problem is likely not the coupler height but the trip pin height which is too low. You can bend the trip pin up slightly. Check the coupler heights with a kadee coupler gauge.