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.
The first railroad to operate with a steam locomotive was the Penydarren Tramroad at Penydarren Ironworks in Merthyr Tydfil, Wales. On February 21, 1804, a locomotive successfully pulled 10 tons of iron and 70 passengers at a maximum speed of 5mph over the 9-mile railroad.