This is the Bachmann 17151 N Scale 3-Dome Tank Car - Philadelphia Quartz Co Rolling Stock

These specialized cars were actually three complete tanks riding on one frame. They could be used to ship different types of petroleum products, such as gasoline, kerosene and home heating oil, or different grades of gasoline such as regular, super and premium to smaller customers from the 1920s to the 60s.
 
Colorful and completely assembled, the models feature body-mounted EZ-Mate II(R) knuckle couplers.