Ken Martin commented:

“I did a little searching and on Helena History

http://www.helenahistory.org/south_of_helena.htm

I found the photo below. The caption with it says:

"Mineral water from the springs at Alhambra was shipped in tank cars to Great Falls to be bottled and sold. 

The water, however, was eventually determined to be radioactive(radim-228), and unfit to drink.”

The tank car says "Mineral water” This would make it separate from the California company which advertises "pure spring water”.

Still a nice lettered car.”

The Helen History link shows a full photo of the car.

Bob Chaparro

Hemet, CA