It was this week and it was a regular Tesco train which more often than not has a class 88.
Tesco normally insist on "electric" so probably the trailing load reflects the locos power.
If it were a positioning move (for the second 66) the second loco would not normally be powered up.
If I can find the video again I'll post a link.
A class 88 on electric is rated at 5,400HP and a class 66 around 3,000HP at the wheels.
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Philip.
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