In plain English
FAR 52.247-59, F.o.b. Origin-Carload and Truckload Shipments, is a contract clause prescribed at FAR 47.305-16(a), most recently dated Apr 1984. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 47.305-16(a), insert the following clause in solicitations and contracts when it is contemplated that they may result in f.o.b. origin contracts with shipments in carloads or truckloads. This will facilitate realistic freight cost evaluations of offers and ensure that contractors produce economical shipments of agreed size.
Prescribing reference: FAR 47.305-16(a).
The official text, verbatim
As prescribed in 47.305-16(a), insert the following clause in solicitations and contracts when it is contemplated that they may result in f.o.b. origin contracts with shipments in carloads or truckloads. This will facilitate realistic freight cost evaluations of offers and ensure that contractors produce economical shipments of agreed size.
F.o.b. Origin-Carload and Truckload Shipments (Apr 1984)
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(a) The Contractor agrees that shipment shall be made in carload or truckload lots when the quantity to be delivered to any one destination in any delivery period pursuant to the contract schedule of deliveries is sufficient to constitute a carload or truckload shipment, except as may otherwise be permitted or directed, in writing, by the Contracting Officer.
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(b) For evaluation purposes, the agreed weight of a carload or truckload shall be the highest applicable minimum weight that will result in the lowest freight rate (or per car charge) on file or published in common carrier tariffs or tenders as of the date of bid opening (or the closing date specified for receipt of proposals).
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(c) For purposes of actual delivery, the agreed weight of a carload or truckload will be the highest applicable minimum weight that will result in the lowest possible freight rate (or per car charge) on file or published as of date of shipment.
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(d) If the total weight of any scheduled quantity to a destination is less than the highest carload/truckload minimum weight used for evaluation of offers, the Contractor agrees to ship such scheduled quantity in one shipment.
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(e) The Contractor shall be liable to the Government for any increased costs to the Government resulting from failure to comply with the above requirements.
(End of clause)