A print roll unit with a housing comprising a first cover portion attached to a second cover portion, the housing including a slot. Improved targeting of glycoproteins to specific tissues is achieved by masking the natural carbohydrate and other surface determinants with high molecular weight polymers, such as, e. Received signals are acquired from different combinations of the transmitter and receiver antennas. The locomotive and tender car controllers may be configured to selectively affect operation of the locomotive and tender car, respectively, based on operational information obtained via the at least one network component.