descr_engine_skeleton.txt

Overview

Unlike descr_skeleton.txt this file is actually used by the game.

Format is :

type		ballista															
anim	idle	data/animations/engine/ballista_idle.CAS	-evt:data/animations/engine/ballista_idle.evt
anim	idle_to_moving	data/data/animations/engine/ballista_idle2move.CAS	   -evt:data/animations/engine/ballista_idle2move.evt

etc.
the type - ballista in that example is the name that needs to be used in descr_engines.txt at:

engine_skeleton		ballista