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Gantry Crane Rail Blockout

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I've got a client that wants to incorporate a 'future' 20 ton gantry crane into their manufacturing facility.  I was envisioning a block out in the slab on ground that is removed and the rail set in the block out, leveled, plumbed and polyurethane fill cast around the rail to set it in place.  This detail is used locally as part of the light rail commuter transit system.
Others in my office are voting for an embedded plate in the bottom of the block out with the rail ultimately welded to the embed plate.  My concern with this approach is alignment and elevation tolerance.  I know from experience that embedded plates don't get the same close tolerances that a rail support needs.  Also, with the future installation of the rail and crane, the General Contractor may not meet the strict tolerances for the rail and the owner might suffer later during rail installation.
As another alternative I was thinking that I could use rail clamps and concrete anchors and shim to the proper elevation.  I'm looking for your input and alternatives. 
Additionally, does anyone ever provide drainage in the annulus next to the rail.  This gantry crane travels from outside the building into the building.
Your thoughts are appreciated.