The Barreiros R-500 B is a farm tractor produced by Barreiros from 1967 to 1969. It features a Barreiros A60 3.3L 4-cylinder liquid-cooled diesel engine producing 60 hp (44.7 kW). The tractor has a 5-speed transmission with 5 forward and 1 reverse gears, two-wheel drive, and an open operator station. It rides on 6-16 front tires and 12-36 rear tires. The electrical system is 12 volts with a generator charging system and negative ground.