“Iron horse” is an iconic literary term for a steam locomotive.
Job 39:19-25 (AMP)
“Have you given the horse his might?
Have you clothed his neck with quivering and a shaking mane?
“Have you [Job] made him leap like a locust?
The majesty of his snorting [nostrils] is terrible.
“He paws in the valley and rejoices in his strength;
He goes out to meet the weapons [of armed men].
“He laughs at fear and is not dismayed;
And [in battle] he does not turn back from the sword.
“The quiver rattles against him,
[As do] the flashing spear and the lance [of his rider].
“With fierceness and rage he races to devour the ground,
And he does not stand still at the sound of the [war] trumpet.
“As often as the trumpet sounds he says, ‘Aha!’
And he smells the battle from far away,
And senses the thunder of the captains and the war cry.
We thank You, Father, for the majesty and strength of the all the intercessors associated with the Glory Train. No weapon formed against them shall prosper. They laugh at fear and are not dismayed. They are armed with the sword of the Spirit, flashing and rattling in this Year of Jubilee, as the trumpets sound everywhere. Amen.