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.
With the first attempt in 1869, over 70 companies were created for the purpose of started an elevated rail system between 1872 and 1900. The accolade of opening Chicago's first rapid transit line went to the Chicago and South Side Rapid Transit Railroad Company.