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The Mark IV HD is the latest model of Harsco Rail's well-known production and switch tamper. The Mark IV HD is equipped with Harsco Track Technologies' Jupiter distributed input/output control system and with System-V software. Ergonomic operator control is provided through arm panel keypads, joysticks, an IBM compatible keyboard and a 17-inch flat monitor as a graphical interface. A solid-state removable USB flash drive is available for the transfer of track recordings and production reporting data. Curves that have been recorded may be transferred to this device and subsequently read by an IBM-compatible PC equipped with the optional System-V office version (USB port required). The alignment of curves may be viewed in the office environment, modified or engineered as desired, saved to a removable flash drive and returned to the machine for use. Upon insertion of the USB flash drive, curve data files transfer automatically, updating the information both on the machine and on the removable device. The climatized cab, air bag cab suspension and user-friendly computer controls are designed to make the operator environment more comfortable and reduce fatigue. Excellent visibility of the work area and the track ahead enhance safe operation, the company says.