Man cars were introduced underground when the distance travel from the mine entrance to the work place by the miners became excessive.  Miners in Arizona were paid “collar to collar”  this means from the time they enter the mine until the time they leave. Arizona miners were also were limited to 8 hour shifts (this changed to 12 hour shifts in 2012) the increased travel time  and lack of production, became too costly. Most miners in Bisbee did not travel  on man cars , they walked instead to their workplace,   Only one version of this car is known and a blue print exists that is dated February 8, 1944. The print states that they are called Underground Passenger Car and are for the Cole shaft.    The 800 level of the Cole shaft back to the interior shaft was a main trip for these cars. The cars are also known to have been used in the in  Junction, Campbell, Dallas lasting until the underground mines closed in 1975.