AHM/Rivarossi steam upper gearbox upgrade kit (speed reduction 32%)

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Directly replaces the upper gearing in IHC/AHM/Rivarossi 2-8-4, 2-10-2, 2-8-8-2, 4-8-8-4, 4-8-8-2, 4-6-6-4. NOTE: Two kits required for articulateds. Reduces engine speed by 32%.

Part Number: 317-6

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AHM/Rivarossi steam upper gearbox upgrade kit (speed reduction 32%)