Old man, can't directly answer your question about the the way the ICEs are delivered to a team, but regardless, don't forget that each team has a dedicated group of engineers from the suppliers embedded in their team when at their bases as well as at the races/tests.
In addition, the PUs required for each race are delivered to the teams from the suppliers at the track on most occasions, but certainly for the fly away circuits. I believe that the days of the teams loading their cars on the transporters with the PUs in situ on the way to or from the tracks are long gone, certainly for racing.
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