Uploaded January 2020 | Updated September 2026, 2 weeks ago

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Check out Geoff's video from the same day!
youtu.be/TTHOyTypNs8

This is the Geoff Marshall video about Oyster zones and four-bits.
youtube.com/watch?v=m0xDbHj4K_E

My previous video with Geoff: Is the London Underground knotted?
youtube.com/watch?v=b9OEuhdM6t8

Listen to my podcast with Bec Hill: A Problem Squared
aproblemsquared.libsyn.com

Thanks to everyone on Patreon who bought me a new lens for my camera. It's exactly the same as the old one.
patreon.com/standupmaths

List of all stations with a platform zero in the UK (as of January 2020) in the order I visited them:

CARDIFF
REDHILL
RAINHAM
GRAVESEND
LONDON KING'S CROSS
DONCASTER
STOCKPORT
EDINBURGH HAYMARKET

If you'd like a copy of Geoff’s 'Platform 0' map:
geofftech.co.uk/download/PlatformZeros.pdf

Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: think-maths.co.uk/standupmaths-videos

CORRECTIONS
- At 18:32 I dip the non-crust end of my pizza in the garlic dipping sauce. I wanted to confess that before anyone complains. It was a long day.
- I said that Cardiff has platforms 1 through 8 and actually there is no 5. I had no idea! I only realised watching Geoff’s video.
- Let me know if you spot anything else!

Thanks as always for Jane Street being my principal sponsor.
janestreet.com

Thanks to my Patreon supporters who help make these videos possible. Here is a random subset:

Nathaniel Brown
Brian Murawski
Louie Ruck
Jim Fitch
Kevin Mannon
Brandon Steed

Support my channel and I can make more maths videos:
patreon.com/standupmaths

Filming by Matt Parker and Geoff Marshall
Editing by Michelle Martin
Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
Maths book: wwwh.umble-pi.com
Nerdy maths toys: mathsgear.co.uk