American Locomotive Company (Alco) RS3 #557 of the Maine Central circa 1963.
This 10oz tumbler is dishwasher safe and made of durable stainless steel. Double-wall, air-gap construction means it will maintain the temperature of its contents for much longer than a regular tumbler.
Capacity = 10 ounces
Height = 4 5/8 inches
Diameter = 3 3/8 inches