After all, page 77 Revised Core Rules:
These lines combined with those you reported don't appear all that clear to me. Am not saying you're wrong or else, but I'd like an "official" clarification...Fatigue Score
A player-hero’s travelling equipment and each piece of war gear possesses an Encumbrance rating, representing the hindrance that the item causes to the carrier, both in terms of weight and discomfort (for example, a helm which significantly limits its wearer’s vision has a higher Encumbrance rating than a suit of leather armour, regardless of weight).
All the Encumbrance ratings of the various items normally carried by a hero are added up to find his Fatigue score, to be recorded on a character sheet alongside his Endurance rating (see page 127 to learn about the effects of Fatigue on a hero).