In short
On May 19, 1906, the Simplon Tunnel opened beneath the Alps, connecting Switzerland and Italy by rail. At nearly 20 kilometers long, it was the world's longest tunnel at the time, cutting travel time between the countries from days to hours and reshaping European trade and movement.
How it unfolded.
The five-minute version
What actually happened.
The Simplon Tunnel is a railway tunnel on the Simplon railway that connects Brig, Switzerland and Domodossola, Italy, through the Alps, providing a shortcut under the Simplon Pass route. It is straight except for short curves at either end. It consists of two single-track tunnels built nearly 15 years apart. The first tunnel is 19,803 m (64,970 ft) long; the last tunnel is 19,824 m (65,039 ft) long, making it the longest railway tunnel in the world for most of the twentieth century, from 1906 until 1982, when the Daishimizu Tunnel opened.
As it was happening
12 voices, 18262 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Simplon route surveyed
Early proposals emerge for a railway crossing beneath the Simplon Pass as an alternative to the surface route.
Voices from this moment (1)
Simplon route surveyed
Jan 1
“Early proposals emerge for a railway crossing beneath the…”
As it was happening
12 voices, 18262 days.
Day 0 · January 1, 1872
Simplon route surveyed
Early proposals emerge for a railway crossing beneath the Simplon Pass as an alternative to the surface route.
“Early proposals emerge for a railway crossing beneath the…”
- Simplon route surveyed, Jan 1
Day 9709 · August 1, 1898
Construction begins
Work commences on the tunnel from both the Swiss and Italian sides, with crews boring through granite and gneiss under challenging conditions.
“Work commences on the tunnel from both the Swiss and…”
- Construction begins, Aug 1
Day 10926 · December 1, 1901
Breakthrough achieved
The northern and southern construction teams meet inside the mountain, confirming accurate surveying and alignment.
“The northern and southern construction teams meet inside…”
- Breakthrough achieved, Dec 1
Day 12556 · May 19, 1906
Tunnel opens
The first Simplon Tunnel opens to rail traffic, connecting Brig and Domodossola and establishing a direct Alpine crossing.
“We have pierced the mountain where nature seemed to forbid…”
- Official opening ceremony speech, Brig-Domodossola railway line inauguration, May 19
“This tunnel binds Switzerland more closely to Italy and…”
- Governmental remarks at Simplon opening, May 1906, May 19
“At 19.…”
- Le Figaro railway supplement article, May 1906, May 22
“The engineers have managed what geology rendered perilous.”
- Scientific address to Swiss Natural Sciences Society, June 1906, Jun 15
“Goods that once took three days now arrive in one.”
- Synthesized from period accounts - Swiss commercial press reports, May-June 1906, Jun 3
“The first Simplon Tunnel opens to rail traffic, connecting…”
- Tunnel opens, May 19
Day 17820 · October 16, 1920
Second tunnel construction begins
Work starts on a parallel single-track tunnel to handle increasing traffic and provide redundancy.
“Work starts on a parallel single-track tunnel to handle…”
- Second tunnel construction begins, Oct 16
Day 18093 · July 16, 1921
Second tunnel opens
The second Simplon Tunnel opens, completing the double-track system nearly 15 years after the first tunnel began operation.
“The second Simplon Tunnel opens, completing the…”
- Second tunnel opens, Jul 16
Day 18262 · January 1, 1922
Record surpassed
The Simplon loses its status as the world's longest tunnel following the opening of longer tunnels elsewhere.
“The Simplon loses its status as the world's longest tunnel…”
- Record surpassed, Jan 1
Afterward
What followed
- 1906 - Simplified Alps crossing. The tunnel eliminated the need to traverse the steep Simplon Pass road, cutting journey times between Switzerland and Italy by hours and making year-round travel feasible
- 1910 - Economic integration of Mediterranean trade. Direct rail access accelerated commerce between northern Europe and Italian ports, shifting freight patterns and establishing new trade corridors through Switzerland
- 1920 - Swiss Alpine engineering reputation. The successful completion cemented Switzerland's position as a leader in alpine engineering and infrastructure, attracting subsequent major projects
- 1930 - Regional development boom. Towns like Brig and Domodossola experienced population growth and industrial development spurred by improved rail connectivity
- 1950 - Tourism infrastructure expansion. Easier access to Alpine regions drove expansion of hotels, mountain resorts, and recreational facilities throughout the Valais region
The visual record.
At the cinema, on the charts.
While the world watched The Great Train Robbery, The Merry Widow topped the charts.
The world it landed in
What was on the radio, the screen, and everyone's mind.
The Merry Widow - Franz Lehár
Operetta premiered one year before tunnel opening; represents Belle Époque optimism about technological progress
The Great Train Robbery (1903)
Railway imagery dominated early cinema; 1906 audience would recognize trains as symbols of modernity
Same week, elsewhere
1906 Europe was intoxicated with industrial progress and engineering prowess. The Simplon Tunnel represented human ingenuity taming nature itself, fitting perfectly with Belle Époque optimism before World War I shattered such certainties. Newspapers celebrated it as proof that technology could solve geographical obstacles, a narrative that would define the early 20th century.
Then and now.
4 measurements then and now - the deltas the event left behind.
Then & now
The world the event landed in vs. the one it left behind.
Tunnel length
19.8 km
1906
19.8 km
2024
Longest railway tunnel in the world at opening; remained so until the Gotthard Base Tunnel opened in 2016
Construction time
8 years
1906
17 years
2016
Gotthard Base Tunnel took significantly longer despite modern equipment
Rail journey time Brig to Domodossola
1 hour
1906
20 minutes
2024
Modern trains traverse the route at higher speeds
Workers involved
2,000
1906
9,000
2016
Gotthard Base Tunnel required substantially larger workforce despite being 9 km longer
Captured in time.
Captured before it changed
The web as it looked, the day it happened.
Wayback Machine snapshots of the pages people actually loaded that day. Click any card to open the archive at full size.
Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.Simplon Tunnel
en.wikipedia.org