There is a stretch of railway not far from here where the grass grows differently.
You notice it if you walk along the service path that runs beside the tracks. The line itself is ordinary enough. Concrete sleepers, steel rails, the low metallic smell that seems to cling to railway ballast everywhere in Europe. Trains pass every so often and the ground trembles slightly under your feet.
But the land immediately beside the tracks feels oddly alive.
The gravel between the sleepers stays mostly bare. A few stubborn weeds push through, but the constant vibration keeps most plants from settling properly. A few metres away, though, the vegetation changes abruptly. Tall grasses lean towards the sun. Thistles grow in loose clumps. Small shrubs appear where no one seems to have planted them.
It looks messy, which is usually the first sign that something interesting is happening.
Railways create a strange kind of habitat. They are narrow, linear spaces where human disturbance prevents development but never quite removes nature completely. The result is a thin strip of land that remains half-wild, squeezed between the order of the city and the strict geometry of the tracks.
Ecologists sometimes call these places corridors.
Animals understand them instinctively. A railway edge offers cover, shelter and a continuous route across landscapes that might otherwise be fragmented by roads and buildings. Foxes use them like highways. Small mammals move along the vegetation line. Birds hop from fence post to fence post, following the same narrow strip for kilometres.
For insects the effect can be even stronger.
Because railway land is rarely sprayed or landscaped in the way parks are, the plants that grow there tend to be the ones that survive without help. Native grasses return first. Then come the flowering weeds that support pollinators. In late spring the entire edge can become a long ribbon of nectar plants, stretching across the city without interruption.
Standing beside the tracks you begin to realise how long these corridors really are.
The line I was walking follows the same route for almost forty kilometres. It passes industrial estates, suburbs, patches of woodland and the occasional abandoned lot where construction stalled years ago. Through all of it the vegetation continues, sometimes thin and scrappy, sometimes surprisingly dense.
From the point of view of a fox or a hedgehog, it must look like a road.
At one point I stopped because something moved in the grass. A small shape slipped out from under the edge of a concrete cable box and paused in the sunlight.
A lizard.
It stayed still for a few seconds, watching me with the alert patience that reptiles seem to specialise in. Then it darted across the stones and disappeared into another patch of weeds closer to the track.
The train that passed a minute later did not seem to bother it in the slightest.
Around this time a man cycling past slowed down and asked if I had dropped something. Apparently standing beside railway tracks and staring at weeds gives the impression that you are searching for a lost phone.
I told him I was looking at a lizard.
He nodded politely in the way people do when they are unsure whether the conversation is finished, then continued cycling.
The interesting thing about railway corridors is that they exist almost everywhere, but very few people notice them. We see them as transport infrastructure, thin lines on a map that connect cities to one another.
To wildlife they are something else entirely.
They are passages through a fragmented landscape. Long strips of unmanaged ground where plants return first, insects follow, and eventually the rest of the food chain begins to move along the same route.
If you stand quietly beside the tracks long enough, you start to realise that the trains are only using part of the railway.
The rest of it belongs to everything moving through the grass at ground level.