Marine engineers held authority over machinery no one else understood

Early engineers had limited social and institutional status but decisive practical authority inside the machinery space. They were outside the regular naval command track and could not expect promotion through it. No two engines behaved alike, so even an excellent engineer had to learn a new plant’s moods and recurring faults from scratch. HMS Warrior’s records include a troublesome boiler familiar enough that people could refer to it without specifying which one. Steam propulsion created a specialist profession whose local knowledge the traditional officer corps could not simply replace.