From Amtrak’s website; September 2, 2020:
Effective October 1, 2020, Express shipping service on Amtrak’s regularly scheduled passenger trains will be suspended until further notice. The last date for accepting these shipments will be September 15, 2020, which will ensure all shipments will reach their final destinations before October 1st.
As an added measure to ensure the health and safety of our customers and employees, Amtrak will temporarily be accepting only shipments under 250 pounds per customer. In addition, human remains will not be accepted.