I am siding with those who hate abbreviations which CAN cause confusion.
I know for the fact that CUS as Chicago Union Station as it is fairly easy for me to figure out because it is Amtrak's home hub, in other word it is like Amtrak's headquarter.
When I used to work for calling center as Technical support, it CAN be confusing when one uses abbreviations because often I see one abbreviations can mean several things, depending on location. I had to work harder to figure out, why can't they just spell it out so I don't have to take another aspirin? Often it is perfect recipe for misunderstanding. That is, after that point I quit using abbreviations with VRS operators, and terps as well.. as I realize not all locations are on same page with abbreviations..
So be careful with abbreviations, don't overuse them.