It is also liquid at normal temperatures given minimal compression. It will be practical to replace bunker oil on ships just by replacing tankage and plumbing,

It is also liquid at normal temperatures given minimal compression. It will be practical to replace bunker oil on ships just by replacing tankage and plumbing, and maybe on trains. As toxic as it is, if leaked it goes up fast, so would not blanket a surrounding area like, e.g. methyl isocyanate (cf.). That said, spilling a lot of liquified NH3 could be bad.