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Keywords: blackandwhite monochrome outdoor black and white (1990-L-04347): This construction photo shows the PRT’s diesel engines in place. The diagonal truss structure supported the 44 drive belts needed to convey the engines’ power to the tunnel’s fan shaft. (1990-L-04347): This construction photo shows the PRT’s diesel engines in place. The diagonal truss structure supported the 44 drive belts needed to convey the engines’ power to the tunnel’s fan shaft. |