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Episode 10 · London

London, a secret railway runs beneath it.

Cheerio! Tiny Zara rides a red double-decker through the capital in a camel coat and tartan scarf — guarding the Crown Jewels, climbing a full English, and uncovering the tiny postal railway hiding beneath the streets.

Watch the episode The reel

WESTMINSTER → TOWER BRIDGE → BUCKINGHAM PALACE → CAMDEN

Tiny Zara in a camel coat and tartan scarf waving from the roof of a red double-decker bus, Big Ben behind, a giant red bus ticket beside her

Zara is 3 cm tall. In London, a bus ticket is a billboard and a teacup is a swimming pool.

← Tiny Travel

Watch this episode with Zara.

The full Tiny Travel episode, in sync with YouTube.

01 / The secret railway

A secret railway hides under London.

Detective Zara is on the case. Beneath the capital's streets runs the Mail Rail — a tiny driverless railway that carried London's letters for 76 years, and almost nobody knew it was there.

Tiny Zara with a magnifying glass in the brick Mail Rail tunnel, a tiny mail train approaching

The railway time forgotSix and a half miles of narrow tunnels, with two-foot-gauge driverless trains shuttling the city's post between sorting offices — from 1927 until 2003.

Case closed.Zara cracked it: the world's first driverless electric railway wasn't for people — it was for letters. Today you can ride it at the Postal Museum.

6.5miles of secret Mail Rail tunnels under London

76years the tiny railway carried the city's post, 1927–2003

4Mletters a day at its peak

3 cmZara's height for the journey

02 / Tastes of London

What London feeds a tiny traveler.

Chip-shop chips, tower-high afternoon tea, a full English the size of a county — and the Sunday roast Zara would move for.

Tiny Zara with a giant Sunday roast

The Sunday roast

Yorkshire pudding the size of a trampoline, gravy like a moat. Zara claimed the roast potato as her castle.

Tiny Zara tasting a chip crumb from a giant newspaper cone of fish and chips

Fish & chips

Newspaper cone, vinegar shower, mushy peas. One chip is a full meal when you're 3 cm.

Tiny Zara climbing a giant three-tiered afternoon tea stand

Afternoon tea

Scones like boulders, sandwiches like mattresses, and a teapot waterfall. Pinkies up, Zara.

Tiny Zara hiking across a giant full English breakfast

The full English

Egg like a sun, sausage like a fallen log, beans like boulders. Zara hiked the whole plate.

Six and a half miles of tunnels, no drivers, four million letters a day. London's tiniest railway did the biggest job.

Zara · detective mode, Mail Rail

03 / Field notes

One tiny traveler. Eight London icons.

From Big Ben to Camden Market — Zara's scale turns London's landmarks into expeditions.

Detective Zara examining a giant vintage postage stamp and airmail envelope with a magnifying glass — The clue stamped and sealed

Tiny Zara at the foot of Big Ben — Right on time at Big Ben

Tiny Zara on Tower Bridge — High above the Thames

04 / London's greatest hits

London's greatest hits.

Eight icons, one 3 cm traveler. Tap any stop for the full-size moment.

Tiny Zara at the foot of Big Ben — Big Ben🕰️ Zara timed the bongs — still on time!

Tiny Zara on Tower Bridge — Tower Bridge🌉 It lifts for ships — Zara waved from the top!

Tiny Zara outside Buckingham Palace — Buckingham Palace👑 Zara saluted the guards — they didn't blink.

Tiny Zara at the London Eye — London Eye🎡 One rotation, 30 minutes — Zara saw the whole city!

Tiny Zara at the Tower of London with a raven — Tower of London💎 The Crown Jewels are guarded by ravens — Zara made friends.

Tiny Zara at Westminster Abbey — Westminster Abbey⛪ A thousand years of coronations — Zara felt tiny. Tinier.

Tiny Zara at St Paul's Cathedral — St Paul's Cathedral🎨 The dome survived the Blitz — Zara sketched it.

Tiny Zara at Camden Market — Camden Market🎶 Zara busked with the street musicians — encores!

The Reel lives on Instagram.

YouTube stays the full episode. The 9:16 Reel opens on Instagram so nothing here is cropped or blank.

Zara in London — open the Instagram Reel

Notes & further reading

London Post Office Railway
The 6.5-mile driverless railway that carried London's mail from 1927 to 2003.
The Postal Museum — Mail Rail
Ride the tiny trains through the original tunnels today.
Tower of London
Crown Jewels, ravens, and a thousand years of history.

Secret: beneath London's streets, tiny driverless trains carried the city's letters for 76 years — and the city above never noticed.

THIS is London… and it keeps SECRETS!

Your turn

Which London secret would you try first?

Pick one of Zara’s three-centimeter London adventures.

Tell Zara.

Pick a side, then leave the why on YouTube — that's where this investigation keeps going.

Comment on YouTube

Where should Zara investigate next?