The Ray Sphere was a device used by transferring the neuro-electric energy from a group of people to concentrate it into a human indevidual to unlock his/her powers. Though it will unlock the dormant abilities of the Conduit, it will kill the catalysts, and worse, cause a catastrophic explosion.
How many gallons of gas does the average mid-size car hold? The average fuel tank size for mid-size cars is 16 gallons. If the  price of gas was $3.59 per gallon, it would cost $57.44 to fill a  16 gallon tank.
The nominal sizes range from 15,800 US gallons to 33,600 US gallons. Importantly, in context, American Railcar is not the only manufacturer of railroad tank cars; other manufacturers offer rail tank cars in a variety of additional sizes. Your question isn't quite as open-ended as how long is a rope, but it's close.