Unadvertised Chiltern Service this week

So, I've noticed there's an extra working in the timetable this week, being 1A49 from Marylebone to Aylesbury. It's showing as unadvertised and I can't see any reason why they'd run it? There's no event going on at Wembley, at least today anyway, nor is there anything else going on in the timetable. All I can see is it being a way to swap out a 2 car 165, with the original heading off on 1A49 and the replacement coming down on 2C54 with the usual 3 car one also on that, but I doubt they'd run a whole extra service just to do that, so surely there's another reason?

Does anyone know why they're running this service this week?

I've also noticed Cross Country doing the same thing this week, with 1O02 to Bournemouth having a replacement unadvertised schedule added, granted, it didn't run like 1A49 did, but it was still strange to notice.

CR165022 said:

Does anyone know why they're running this service this week?

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I imagine because they need to run it.
And they need to run it without everyday members of the public knowing about it.

Isn't there a series of rock concerts at Wembley on Wednesday, Friday and Saturday evenings this week? Maybe to do with that?

It's in MTThO

https://www.realtimetrains.co.uk/service/gb-nr:S06134/2026-07-07/detailed

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And there are no events going on these days.
It's nothing to do with anything which may or may not be occurring at Wmbley stadium.

It's early peak and so will be there for a reason.
I highly doubt that if you rock up in London for it, it will not be displayed on the boards (although given the nature of rolling stock you may well see a unit there).

Mcr Warrior said:

Isn't there a series of rock concerts at Wembley on Wednesday, Friday and Saturday evenings this week? Maybe to do with that?

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Indeed, and you are appropriately-named to note that!

Medicy said:

Indeed, and you are appropriately-named to note that!

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See what you did there!

“Unadvertised Express”. Exactly what it says on the tin. Unusually large single groups, known weeks in advance. See also 1Z22 on 4 & 11-July.

How do people (you folks) find these things?

800002 said:

How do people (you folks) find these things?

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Because some of us folks are in the right place at the right time to know these things.