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Spoilers for Books 1–8
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All eight books included

Portable train barricades · Introduced in Book 3
Gangway Chock and door blocks
Carl makes metal chocks and blocks to barricade railway doors against pursuing monsters. A block needs to fit the opening and have something solid to brace against.[1]
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History
Book 3
The Dungeon Anarchist’s Cookbook
Carl’s first design is based on an estimate, and the large block does not fit the next doorway. Katia has to hold a smaller heavy plate in place because there are no suitable gaps to anchor it.[2]
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Book 3
The Dungeon Anarchist’s Cookbook
A locked block later holds the Daughters outside the cab. It withstands their spells while Carl reverses the train.[3]
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Sources
References are to Matt Dinniman’s novels. Book links open our recap guides.
- The Dungeon Anarchist’s Cookbook, Chapter 5.
- The Dungeon Anarchist’s Cookbook, Chapters 5, 12.
- The Dungeon Anarchist’s Cookbook, Chapter 24.