Question: How much money was robbed in a shippment from the San Francisco Mint to a bank in the East that is the biggest single robbery in the history of the a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans?
Context: The Burlington Junction Railway (reporting mark BJRY) is a Class III short line railroad which was chartered in 1985.  Originally operating on the southernmost 3 mi of the former Burlington, Cedar Rapids and Northern Railway mainline in Burlington, Iowa after abandonment by the Chicago, Rock Island and Pacific Railroad, it provides short freight hauling, switching operations, locomotive repair, and transloading services, the latter currently handling over 3,000 carloads a year.  Typical commodity types transported include chemicals and fertilizer.  The BJRY's primary interchange partner is the BNSF Railway. St. Louis–San Francisco 4018 is a class USRA Light 2-8-2 "Mikado" steam locomotive which operated for three decades hauling freight between Bessemer and Birmingham, Alabama (United States), on the St. Louis–San Francisco Railway (SLSF or "Frisco").  It went on display at the Alabama State Fairgrounds in 1952 and is one of only a few locomotives of its type that survive. The Kalākaua coinage was a set of silver coins of the Kingdom of Hawaii dated 1883, authorized to boost Hawaiian pride by giving the kingdom its own money.  They were designed by Charles E. Barber, Chief Engraver of the United States Bureau of the Mint, and were struck at the San Francisco Mint.  The issued coins are a dime (ten-cent piece), quarter dollar, half dollar, and dollar. Indian Head cents, designed by James B. Longacre, were minted in the United States from 1859-1909.  Due to the American Civil War, the composition changed in 1864 from a copper-nickel alloy to a bronze alloy, going from 4.67 grams to 3.11 grams.  Coins without a mint mark were minted in the Philadelphia Mint, and coins with the "S" mint mark were minted in the San Francisco Mint. The Union Pacific Railroad (or Union Pacific Railroad Company and simply Union Pacific) is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans.  The Union Pacific Railroad system is the largest in the United States and it is one of the world's largest transportation companies.  The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska. The Missouri Pacific Railroad (reporting mark MP) , commonly abbreviated MoPac, with nickname of The Mop, was one of the first railroads in the United States west of the Mississippi River.  MoPac was a Class I railroad growing from dozens of predecessors and mergers, including the St. Louis, Iron Mountain and Southern Railway (SLIMS), Texas and Pacific Railway (TP), Chicago and Eastern Illinois Railroad (C&EI), St. Louis, Brownsville and Mexico Railway (SLBM), Kansas, Oklahoma and Gulf Railway (KO&G), Midland Valley Railroad (MV), San Antonio, Uvalde and Gulf Railroad (SAU&G), Gulf Coast Lines (GC), International-Great Northern Railroad (IGN), New Orleans, Texas and Mexico Railway (NOTM), Missouri-Illinois Railroad (MI), as well as the small Central Branch Railway (an early predecessor of MP in Kansas and south central Nebraska), and joint ventures such as the Alton and Southern Railroad (AS). The San Francisco Mint is a branch of the United States Mint and was opened in 1854 to serve the gold mines of the California Gold Rush.  It quickly outgrew its first building and moved into a new one in 1874.  This building, the Old United States Mint, also known affectionately as The Granite Lady, is one of the few that survived the great 1906 San Francisco earthquake.  It served until 1937, when the present facility was opened. The Union Pacific Big Springs Robbery of 1877 was a robbery of $60,000 in newly-minted $20 gold pieces being shipped from the San Francisco Mint to a bank in the East.  Coverage of the sensational heist in the contemporary press made famous Sam Bass and his gang of "Black Hills Bandits."  The event remains the biggest single robbery in the history of the Union Pacific Railroad. Frank Aleamon Leach (August 19, 1846 – June 19, 1929) was a United States newspaperman who was Director of the United States Mint from 1906 to 1909.  In the aftermath of the 1906 San Francisco earthquake, the heroic efforts by Frank A. Leach and his men preserved the old San Francisco Mint building and the bullion that then backed the nation's currency. The Illinois and Midland Railroad (reporting mark IMRR) is a railroad in the U.S. state of Illinois, serving Peoria, Springfield and Taylorville.  Until 1996, when Genesee & Wyoming Inc. bought it, the company was named the Chicago and Illinois Midland Railway (reporting mark CIM) .  It was once a Class I railroad, specializing in the hauling of coal.  At the end of 1970 it operated 121 route-miles on 214 miles of track; it reported 255 million ton-miles of revenue freight that year.
Answer: $60,000