I worked for a year and a half as a contractor Carmen on the bnsf. A slack adjuster is a threaed rod with adjusting nuts on the threaed portion that can adjust for proper tension on the brake rigging...
In total we use 20.68 million barrels per day. So, if we divide this by the US population (303 million), we use per person, 0.068 barrels of oil per day. This is 2.86 gallons. It is also 24.9...