The Traktionstadtsgesellschaft is an collective of Germanic traction cities that are introduced in the fourth novel of the Mortal Engines series, in A Darkling Plain.

Originally, it was a collective of twelve German-speaking traction cities who joined together to resist the advance of the anti-tractionist army Green Storm who were intent on destroying all traction cities.

The battles that followed eventually led to a stalemate between each side. Cities who did not join the 'front lines' of Traktionstadtsgellschaft often sent money or supplies to help in the war effort, and also profited from selling the alliance weapons.

The cities entered into explicit agreement not to prey on each other until the war with the Green Storm was won however some less-ethical towns such as Wolf Kobold's Harrowbarrow continued hunting for prey as he thought the Traktionstadtsgesellschaft's deferral of Municipal Darwinism would lead to the small city losings its edge.

The Traktionstadtsgesellschaft grouping was effectively destroyed when the Stalker Anna Fang attacked and destroyed most of its bigger cities with the ODIN weapon which she had taken control of.

How does one pronounce the word 'Traktionstadtsgesellschaft'?

It's not easy to say if you break it down in the following way:

Traktion (Traction) Stadt (City) Gesellschaft (Society)

We understand that the German title for the movie will be "Mortal Engines: Krieg der Städt. This translate to War of the Cities. 

Artwork by Keak