Originally Posted by
drnp
if you want to use the luggage storage in Union Station, it is near the departure area for the Amtrak lines. If you are facing all of the Amtrak gates, head to your left till you reach the end of the gates, it directly across from a restroom.
Thanks everyone for all their help. As was stated, the luggage storage at Union Station is at Gate "A" across from the men's room.
I left a rollaboard there yesterday for 6 hours and the cost was $20.