The French seem to move a lot of their (remaining) rail borne freight under the wires with a diesel, not necessarily a type 5/6, second in the consist, apparently for the final mile, ( kilometre).
How come we've never thought of this?
Probably same reason they have dual voltage locos, 1500V DC and 25kV AC, instead of closing 1500 V lines, scrapping 1500V locos and/or replacing 1500V ohl with 25kV.
We just chuck money away.