The Zooliner is powered
by a Caterpillar 3208 and is shown in
the lower left photo. The coupling system and hose connections
are seen in the lower right photo. Also from the zoo web site,
"This
diesel-powered streamliner was built in 1958. A replica of
General Motors’ "Aerotrain," the engine’s 165
horsepower is transmitted to eight driving wheels through a
hydraulic-type torque converter transmission and spiralgears. Safety
features include a "dead man control" to ease the train to a halt in an
emergency. A governor holds the train to a 12-mile-per-hour
maximum. A
conventional automatic air brake system provides safe train handling."