Dirt cutter head attachment for clay, slit and sand. Carbide cutter head attachment for soft to medium hard rock. Sand shelf attachment for loose, uunstable soil, but not flowing. The opeator station is located along the inside of the TBM wall beside the conveyor. The operator can control the TBM steering and monitor or adjust the spoil removal as necessary. TBM Interior With Conveyor Operator station with six-way control valve. This valve controls the inner drum, conveyor, steering, dirt wing, and closed face doors. Methane Gas Detection System Akkerman Inc. reserves the right to improve its...