Union Pacific 4884 Big Boy Locomotive | Old Machine
#0183;#32;The steam flowed into the front of the cylinder and filled its 14,176 cu in (232 L) volume, pushing the in ( mm) diameter piston back 32 in ( mm) to the rear end of the cylinder. The steamdistribution valve then slid rearward to open the front part of the cylinder, exhausting the spent steam to the smokebox.