@NuclearWang, indeed - even though day is a term representing a time-span is still doesn't quite sound correct. I'd guess that the ambiguous reference to either daylight hours or 24 hours introduces too much scope for interpretation. Day-long does imply daylight hours more than 24 hours.

Thanks Josh. I wonder if (should the door not be correctly positioned) the train company would accept me instructing the drive to move the train?

Thank you Brian, and for pointing out that 'that' is missing from the sentence entirely.