Supporting rack-mounted computing devices

A data center rack system, comprising:

• a rack housing that comprises side panels and a top panel coupled to the side panels, the top and side panels defining a rack volume sized to enclose a plurality of data center server rack trays, each of the data center server rack trays configured to support a plurality of heat generating electronic devices;
• and
• a rack bottom coupled to the side panels to at least partially define the rack volume, the rack bottom comprising a bottom panel having a top surface coupled to the side panels and a plurality of blocks coupled to a bottom surface of the bottom panel opposite the top surface, at least one pair of the plurality of blocks defining an opening between the blocks and below the bottom surface of the bottom panel and sized to receive a lifting member of a lifting machine, the rack bottom further comprising a cooling liquid inlet and a cooling liquid outlet, where at least one block of the at least one pair of the plurality of blocks is slidable along a dimension of the bottom panel to vary a size of the opening between the at least one pair of the plurality of blocks;
• a utility track that extends from the rack bottom, through the rack volume, and to the top panel along at least one of the side panels, the utility track comprising a plurality of electric power outlets electrically coupled to at least one electrical power inlet mounted on the rack housing;
• and a plurality of network outlets communicably coupled to at least one network connection mounted on the rack housing.