Miller Engineering # 0072  Small Railway Express Billboard: 

A great sign from the past! Once almost as well known as UPS is today was the Railway Express Agency.  In 1917 there were seven express companies in the United States; they were
consolidated into one, the American Railway Express
Agency, during the First World War. REA began an Air
Express Division in 1927. Sadly the company filed for
bankruptcy in 1975.
This sign will be available in two sizes this October. These
signs will also have a second set of contacts which will
allow the option of flush mounting the sign on the side of
building. This is a limited edition sign.

#0072  Size: 2.1” wide x 2.25” tall, Railroad Express
Suitable for HO & N scales

Railway Express operated from 1917 to 1975.