Unknown date events

• A wooden railway on Beacon Hill in Boston
  Boston
  Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...
  
   carried excavations down the hill to clear the land for the State House

December births

• December 10 - Matthias W. Baldwin
  Matthias W. Baldwin
  Matthias William Baldwin was an American manufacturer of steam locomotives. He opened his machine shop in 1825...
  
  , American
  United States
  The United States of America is a federal constitutional republic comprising fifty states and a federal district...
  
   steam locomotive
  Steam locomotive
  A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
  
   manufacturer (d. 1866).

Unknown date births

• John B. Jervis
  John B. Jervis
  John Bloomfield Jervis was an American civil engineer. He was America's leading consulting engineer of the antebellum era . Jervis was a pioneer in the development of canals and railroads for the expanding United States...
  
  , Chief mechanical engineer
  Chief Mechanical Engineer
  Chief Mechanical Engineer and Locomotive Superintendent are titles applied by British, Australian, and New Zealand railway companies to the person ultimately responsible to the board of the company for the building and maintaining of the locomotives and rolling stock...
  
   of the Mohawk and Hudson Railroad who pioneered the use of the leading truck on steam locomotive
  Steam locomotive
  A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
  
  s (d. 1885).