Here is a list of the wood chip hoppers Weaver cataloged:
U27000 Undecorated (black)
U27001 B&M
U27002 Burlington Northern
U27003 Canadian National
U27004 MEC
U27005 New Haven
U27006 Norfolk Southern
U27007 PRR (black)
U27008 ATSF
U27009 Southern Pacific
U27010 Union Pacific
U27011 Western Maryland
U27012 PRR (oxide)
U27013 BAR
U27014 Candian National (from 2015 catalog - don't know if ever produced)
Most road names had 6 road numbers. I have both types of PRR ones and they look great once a load is added.
Andy