I'll second Shed Cat's comments. Thanks Les, your explanations go a long way towards explaining matters.
To go back to my original TSR query, I am now starting to think that the two light engines that I saw going "noticeably slower" than the passenger trains were doing so for completely different reasons. Today I saw a light engine pass through the TSR much faster than the other two and certainly way above the speed that freights do.
Your mention of light engine speed limits does, however, bring one question to mind....... Would a consist of say 5 locos coupled together still be subject to the same conditions as a single light engine?
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