The point I was making was that it's not possible to do that
after "on the day" using Realtime Trains' "quick search" (the "search box" you're referring to) - even when using the "detailed" suffix, it can only search for workings "today" as it says (which means the same day as the search).
@XCTurbostar, we still don't know what workings all these headcodes refer to on days after they ran, because they can only be put into RealtimeTrains' "quick search" box on the same day as the day that the workings run.
Why aren't you providing the start points and times, destinations and Realtime Trains schedule links for these headcodes?
Thanks for explaining this.
features.rcts.org.uk
I'm assuming that I've found the right page.