Hello! Can someone please help me identify the couplers I need to replace. I have attached a photo of the engine and car couplers. They are from an old Acela HHP-8 set. I measured them as close as I could. Bachmann doesn't put the measurements on the parts store site, and I am not sure about what identifies a center knuckle versus other types. THANK YOU!
The upper coupler (16/64") in your pic is a Short Underset Shank Coupler, the lower one (25/64") is a Long Center Shank Coupler.
The short couplers are normally referred to as having a 1/4" shank, rather than 16/64".
A medium, or standard, shank coupler has a length of 19/64".
Len
I have the Kadee catalog which can be really helpful. You can download a digital version here:
Kadee Digital Catalog (https://www.kadee.com/digital-catalog)
I have found PDF Page 7 onwards particularly helpful.