The Walthers RD4 hoppers are not accurate at all but kit-bashing or scratch building 30+ cars was not an option. The couplers were upgraded and air hoses added. I also made cut levers but when I installed the trucks they interfered so I had to remove them. For the weathering I used Polly Scale grime for the insides of the cars and railroad tie brown on the outsides. After the cars were weathered I added the safety stripes.