The _John Hancock_, unaltered, was merely renamed the _Thomas Jefferson_ (figure 40), a “grasshopper” of 1835. Why the _John Quincy Adams_, itself built in 1835, was not used for this purpose under its original name, is not now understood. (The _Martin Van Buren_, now no longer in existence, was altered considerably at that time to resemble the _Mazeppa_, a so-called “crab” engine of 1838.) [Illustration: Figure 38.—_Andrew Jackson_, bearing number “7,” in a photo taken between 1850 and January 1, 1884, at which time it was renumbered “2.” Note tender.] [Illustration: Figure 39.—_Andrew Jackson_, as remodeled to resemble _Atlantic_, with Charles B. Chaney at throttle—a photo taken at B & O Mount Clare shops, July 7, 1912. Note wooden barrel used as water tank.] The original _Andrew Jackson_, ever since called the _Atlantic_ (figure 41), has appeared at many railroad pageants throughout the East (figure 42); in 1935 and 1936 it was on exhibit in the National Museum (figure 43). The _John Hancock_, on the other hand, was recently given back its original name (figure 44) after having carried the incorrect appellation _Thomas Jefferson_ for about 60 years. Many railroad historians of recent times have apparently not been aware of the name-switching involving these two locomotives, which are now part of the permanent collection in the B & O Museum. [Illustration: Figure 40.—_John Hancock_, bearing name _Thomas Jefferson_, at the Fair of the Iron Horse, September 30, 1927. When first placed in service, “grasshoppers” did not use metal water tanks.] [Illustration: Figure 41.—Recent photo of so-called _Atlantic_. Note absence of side rod that originally connected the two axles.] [Illustration: Figure 42.—So-called _Atlantic_ in 1935, with modern reproductions of the famous Imlay passenger coaches used on B & O in the 1830’s.] [Illustration: Figure 43.—So-called _Atlantic_ on exhibition in National Museum hall of transportation, in 1935.] [Illustration: Figure 44.—_John Hancock_ photographed during a recent appearance.] [Illustration: Figure 45.—_John Quincy Adams_ as restored for exhibition at Dayton, Ohio. This is the oldest complete American-built locomotive in existence. Metal water tank is not original.] The _John Quincy Adams_ (figure 45), recently restored and repainted and no longer referred to as the _Traveller_, is the oldest complete American-built locomotive in existence.