'Mighty Pen' Defensive Library System

 is a module for your Locomotive.

Description
''A miniature pneumatic library, staffed by a stalwart rat-archivist with a working grasp of the Dewey Decimal Clasification system. The library's tiny volumes catalogue the perils of the High Wilderness, and the best ways to avoid or mitigate them.''

Obtaining
 can be obtained by exchanging 9 Experimental Modifications at the Royal Society.