Belgique,
That's very interesting, although I must confess I don't understand the Dreadle Treadle (too technical for me, I guess).
Of course, my question was rhetorical. I disagreed with In the Slot's premise that one or more members of the SQ006 crew was unsure they were on the correct runway but, collectively, they decided, what the hell, it probably is, let's go. I don't think airline crews would do that but maybe that's wishful thinking on my part. (Then I hark back to the China Airlines crew taking off from a taxiway bearing 246 deg when cleared for a Rwy 32 departure at ANC in January and I don't know what to think).