On 2015\12\23 10:11, Peter Smyth wrote:
Basil Jet wrote:

The online timetables at the Southwest Trains site
http://www.southwesttrains.co.uk/uploads/1512ptt01.pdf and the
timetable at the Network Rail site show that there is a new Sunday
only service from Waterloo terminating at Kingston via the Hounslow
Loop with a reversal at Twickenham.

However, the Southwest trains personal timetable printer at
http://www.southwesttrains.co.uk/cre...timetable.aspx and also
the TfL journey planner seem to include no such trains, and a
personal timetable from Hounslow to Kingston requires a change at
Feltham (not Twickenham). A bit more experimentation to work out
where the trains that reverse at Twickenham are going shows that
there is a direct service from Datchet to New Malden... I presume
these trains are going from Windsor to Waterloo via the Kingston Loop
with a reversal at Twickenham. So what's really happening, and why
the difference between the generic timetables and the personal
timetables?

What date are you looking at? It is not running this Sunday due to
engineering works, but if you try 3rd Jan it should appear.

http://www.realtimetrains.co.uk/trai...01/03/advanced

You're right, engineering work was the cause. It threw me because there
is so much engineering work that 3rd Jan and 20th March seem to be the
only Sundays in the first three months of the year where the service
actually runs.