And neigh like Boanerges — (14)
Boanerges is a kind of nickname Jesus gave to two of his disciples for being super-fiery and bombastic preachers. It means "son of thunder." To say that the train's "neigh" is like Boanerges depicts it in pretty mighty terms.
[…] punctual as a Star (15)
The movement of the stars in the sky has long been seen as one of the constants of the known universe. This comparison to the stars implies that the railroad has now become as powerful and trustworthy (and out of human control?) as the heavens.
[…] docile and omnipotent (16)
Hmm, need we really say more about this? The word "omnipotent" kind of says it all. This train is the most powerful thing out there.