Non-stop School Trains, Central Line

Then that's a puzzle. From the timings mrfs has given, the first journey was INTO town and the second out - or did the kids go out in the afternoon and come back the next morning?

Otherwise you'd expect the 'down' journey to be in the morning and the 'up' in the afternoon.

The answer to this certainly lies in the date, 1964. Short of looking at the timetable office notebooks - which I believe still survive - the only way to work this out is to understand what was happening in those days.
At that time most London schools fell under the control of the London County Council (LCC). To make things more efficient, they had centralised a lot of the infrastructure and this sometimes meant moving pupils around to shared facilities. This was very visible in south London, where convoys of buses could be seen all day long conveying pupils between the numerous school and the 80 acres of playing fields that the LCC owned in Merton. For those interested in buses, many of these vehicles were operated by private contractors who used a variety of ancient vehicles, many of which should have been in a museum (even in those days).
The post war baby-boom had also filled schools beyond capacity and the LCC made up the shortfall in space by sharing classrooms between physically separate schools and expanding into other available premises, such as drill halls. In those days, it was not at all unusual to see whole classes of pupils walking through the streets (unaccompanied) to lessons in satellite locations. Obviously if the distances were greater - as in the south London example - transport would have been provided and, presumably, this would have included use of the railways of the London Transport Board where they were available.
While it would make perfect sense to run a special train to cover a regular daily movement of pupils, the timing does seem unusual as it appears to span the lunch period. Is there any chance that we could have the exact times that the pupils would have departed and arrived at the stations? It might then be possible to gain some insight into what was happening.

When I've finished at work and popped to the local medicine shop I'll check in the WTT mountain at home.

Interesting that you should say late 70's as my run of WTTs starts in about 1969 and I've not noticed this particular column note before. Could it be possible that the school specials were shewn in separate Timetable Notices?

The TT it comes from is interesting insofar as it is the first 24 hour format one for the Central and gets very confusing with a set of "A" pages and "B" pages covering Thursdays Only operations part way through the Mon-Fri services.

Thank-you all for your answers thus far.

I'd suspected that - but hadn't yet formulated the question. ;D