Oxford to Leamington Spa rail line closed on Tuesdays?

The line is closed on Sunday 21 July. During this closure - people will be bused by the railway to the other side of the closure.
Where did you see the Tuesday closure? It would be very unusual to close a line for engineering work on a Tuesday.https://www.nationalrail.co.uk/engineering-works/leamington-spa-and-oxford-20240720/

I assume you are looking at Tuesday 30 July- that is engineering work between 27 and 31 July- https://www.crosscountrytrains.co.uk/travel-updates-information/major-engineering-work/oxford-2024

That applies to the one week only, not to other weeks. So if you look at 23 July for instance trains are running as normal.

That bus also runs on Monday and Wednesday of that one particular week- 29 and 31 July

Thanks for the quick responses.
I discovered the closures when using the scheduler (e.g. as if making a purchase) to explore timing and price of advance tickets. I selected two different Tuesdays in July and found no trains running. I found very generic statements about work being done on the line, but no conclusive statement about when that work would be concluded.

the information about the closing of the line - including the specific Tuesday - is at https://www.nationalrail.co.uk/engineering-works/banbury-20240727/ which reads:

Buses replace trains between Leamington Spa and Bicester Village /
Didcot Parkway from Saturday 27 to Wednesday 31 July See all service
disruptions

Engineering work details Starts 27 Jul 2024 to 31 Jul 2024

Train operators affected

Chiltern Railways CrossCountry Great Western Railway Route(s) affected
Chiltern Railways between Birmingham Moor Street and London Marylebone

CrossCountry between Manchester Piccadilly and Bournemouth and between
Newcastle and Reading

Great Western Railway between Banbury and Oxford / London Paddington

Description Engineering work is taking place between Leamington Spa
and Bicester North, closing all lines.

Chiltern Railways:

Buses will replace trains between Leamington Spa and Bicester Village
(connecting out of Oxford services).

CrossCountry:

Buses will replace trains between Leamington Spa and Didcot Parkway.

Great Western Railway:

Saturday and Sunday:

Buses will replace trains between:

Didcot Parkway and Oxford (fast).

Didcot Parkway and Oxford via Appleford, Culham and Radley.

Oxford and Banbury via Tackley, Heyford and Kings Sutton.

Monday to Wednesday:

Buses will replace trains between Oxford and Banbury via Tackley,
Heyford and Kings Sutton.

Check before you travel:

If you are travelling with CrossCountry, you can plan your journey
using the National Rail Enquiries Journey Planner

If you are travelling with Chiltern Railways or Great Western Railway,
these changes are not currently shown in the National Rail Enquiries
Journey Planner, please check back nearer to the time of travel.

Engineering work on the line tends to happen within the announced windows. Occasionally there is overrunning engineering work which can affect the first trains immediately after the window but that is not common.

If they say it is one night, I believe them. If they say it will be 5 days I believe them.

If it is an emergency closure due to some sort of incident it can become open ended.

This is a planned closure and it will be expected to run to time.

Is that the day you are concerned about? That's the only Tuesday I can see affected. Too early to know about August.

Thanks, Nigel. I'm actually travelling in September. I'm trying to book hotels ahead of time, which is why I was concerned about work on this line: if a closure made it preferable to shift my travel dates, I can't make non-refundable hotel reservations (which are always cheaper). I was also concerned because an early morning train would get me to Leamington in time for a 9:30 meeting, but the alternate bus route would make me late. But I see now that the closure is not a recurring event. Alas, there is no way to know at this time what closures might affect travel in September.

Looking at the detailed timetable, not seemingly in the journey planners yet, on those July days there is a non stop bus from Oxford to Leamington Spa as well as the stopping ones to Banbury, change for LS.
That leaves Oxford at 47 minutes past each hour from 0547. So the 0747 arrives at Leamington Spa at 0907.
The fast ones coming back are at 45 past the hour, arriving Oxford 1:20 later at 5 minutes past the hour.

Normally such timetables are well padded, so I would be confident about arriving on time.

So if the Meeting was that Tuesday you could still make the 0930 meeting. I don't know why they are not in the journey planners yet.