Train:
Didn't he write something like $500 pr gallon ?
Anyway, it was a fun read. The part about holding the LN2 in thermo's really reminded me of when I was studying to be a Chemical Engineer (gave it up for computers), and some genius tried to transport fluid Chloride in thermos, which leaked
Luckily noone was seriously injured, although something like 10 people was taken to the hospital, and he was ever after thoroughly avoided whenever he was seen in the halls with a thermo
I had a teacher who demonstrated LN2 to us, it was great

He started off by freezing a rubber tube and smashing it with a hammer, which is a pretty ordinary way of demonstrating, but the proceed to throw it at people! Of course it evaporated before it reached us, but the shock effect was there

He finished off by pouring the remains onto his desk and leaving, it was great fun
