bking,
I can't help you with what is in those tubes, however replacement tubes are available from the regular parts vendors. Clear liquid for the water tower, and and amber or yellow color for the oil derrick.
Try Joes's train repair in Rougemont NC
Portlines hobbies
Web search will give you links or phone ordering information.
Hope this helps,
George
I am repairing an AF #772 "red" water tower.
There is no liquid in the tube.
What liquid was used in this bubbling tube?
I read that methelyene chloride is used, which is paint remover. But all of my paint removers are too thick to get into the small opening at the top of the glass tube.
Thank you in advance for your help on this. Bob
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