I had a ticket for a roomette for Train 21 and was waiting in the Metropolitan Lounge for boarding. The call for Sleeping Car passengers was late because when I arrived at the departure doors there were passengers already walking towards the sleeping car and the lead for the group saying "Sleeping car passengers boarding". As I moved towards the platform door it was closed in my face with the Amtrak employee shouting "move to the right and make one line". I told her I was a sleeping car passenger and was ignored. Standing beside the coach passenger line, after 4 minutes I was finally able to get another Amtrak employee to notice my ticket who exclaimed "Why are you here, you should be boarding with the sleeping car passengers" and let me through to the platform. I proceeded down the platform, past those coach passengers waiting to board, until I reached Conductor Nick. As I neared him he blocked my path and began screaming at me to "go back to the end of the line". I explained I was a sleeping car passenger and he screamed more loudly "I don't care, go back to the end of the line". I tried to show him my ticket and pointed to the sleeping car passengers boarding the cars down the platform. He refused to look at it and screamed if I didn't go to the back of the line he would call security and have me thrown out of Union Station and banned from riding Amtrak trains. I then asked him to call his supervisor, he refused, and screamed again that "Did I want him to call security and have me thrown out of Union Station." I did not go to the back of the line and I did eventually board the train, but it was my last trip on Amtrak. When I wrote Amtrak about this experience I never got a reply. I used to be a semi-frequent rider, now my hope is Amtrak goes out of business.