Walthers 910-46517 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47516 St. Mary's West SMW The cab front roofline was

The cab front roofline was set back in a unique brow

This major change

High-Voltage Transmission Tower (933-3121)

a calculator

and a harder body line lower near the middle of the wheel wells that extends the length of the shell

Walthers 910-46517 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47516 St. Mary's West SMW The cab front roofline wasWalthers 910 46517 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47516 The Association of American Railroads had been trying to set design standards for freight cars starting in the early 20th century. The early designs were not widely embraced. Many railroads preferred their own designs. By the time the 1937 AAR boxcar was introduced, this had begun to change as each new design standard provided higher capacity, lighter, more durable cars.