The City of Lightning by Phil and Kaja Foglio, coloring by Cheyenne Wright
Girl Genius: the Second Journey of Agatha Heterodyne Book Two.
Tradepaperback – Airship Entertainment – Sep2016 –
The battle with the sentient locomotive takes some unusual turns, and leads the whole crew to that center of civilization – Paris!
Collects the pages from the webcomic Girl Genius,