An ounce is a unit of weight which is approximately equal to 28  grams. One gallon is equal to 128 ounces so there are 640 ounces in  5 gallons of water.
The first U.S. railroad to use a steam locomotive in revenue service was the South Carolina Railroad. It opened on Christmas Day 1830 using the Best Friend of Charleston steam locomotive on six miles of track in Charleston, South Carolina.
On Christmas Day, December 25, 1830, the Best Friend of Charleston became the first regularly scheduled steam locomotive passenger train in the United States. The locomotive made its initial run on the first six miles of track of the South Carolina Canal and Railroad Company.