The Saffron Line (Empire's of Brass and Ley, #5)

The final book of Empires of Brass and Ley brings Ned Vale to the war-torn Saffron Line, where victory depends not on glory, but on steam, and courage, and the ugly machines that keep ordinary men alive.

As the fragile mountain supply route comes under attack, Ned must prove what a maker is worth when the whole line begins to break.