Why old railway lines make such rewarding walks

Britain's disused railway paths are a quiet gift to walkers. Where a branch line once carried coal, milk churns and the occasional excursion train, you now find a ribbon of level, well-drained ground threading through farmland, woodland and hidden valleys. The gradients are the great secret: railways could never manage the steep pulls that roads and footpaths take in their stride, so the trackbed tends to climb gently on long embankments or slip through cuttings instead. For anyone who finds stiles, gates and relentless ups and downs a chore, that makes old lines ideal.

They also take you places you would otherwise never see. Because the route was engineered rather than wandered, it cuts straight across estates and field boundaries, giving walkers a corridor through private land that has stayed remarkably undisturbed for half a century or more.

Bridges, embankments and cuttings: reading the landscape

Once you know what to look for, a disused line becomes a lesson in Victorian engineering. Start with the overbridges — often handsome brick arches, sometimes with a stone string course, carrying a farm track over the railway. Look for the ghost of a signal post footing beside the parapet, and the soot-blackened underside where locomotives once passed. Sharp-eyed walkers spot skew bridges, built at an angle to the line, and the occasional occupation bridge placed purely so a landowner could reach a field.

Embankments are the raised banks carrying the track over dips in the land; cuttings are the opposite, where the route was carved through higher ground. Both are artificial habitats, and both are now valuable. South-facing embankments warm early in the year, while damp, shaded cuttings suit mosses, liverworts and ferns. You may also pass a brick-lined tunnel portal, a water trough, a milepost or the remains of a small halt with its platform edge still visible beneath the grass.

Wildlife along the trackbed

This is where disused railways really earn their reputation. The ballast — that gritty, lime-rich stone once packed between sleepers — has weathered into a thin, free-draining soil that supports plants you would not find in the surrounding fields. On warm, sheltered stretches, look for common spotted orchids, bee orchids, cowslips and wild thyme, along with uncommon mosses and lichens on exposed brickwork.

Butterflies follow the flowers. Sunny embankments can hold marbled white, ringlet, speckled wood, dingy skipper and the fast, low-flying grizzled skipper. Where nettles grow in patches, expect peacocks, small tortoiseshells and commas. Reptiles appreciate the tussocky grass and loose stone: slow worms and common lizards bask on sleepers and brick edges, and in a few southern and western sites, adders are present. Keep dogs close and watch where you put your hands.

Birds vary with the surrounding landscape — whitethroats and yellowhammers in the scrubby edges, woodpeckers and nuthatches where the line runs into woodland, kestrels hovering over adjoining rough pasture. Old stations and goods sheds sometimes shelter bats, so never disturb roosting sites.

Heritage hidden in plain sight

Walk slowly and the line tells its own story. A length of rusty rail set into a platform edge, a leaning fence of railway sleepers, a weighbridge plate, or a row of railway cottages with their characteristic windows — these are the everyday relics of a network that once reached almost every market town in the country. Some routes still have their station buildings converted into homes, or a goods yard that has become a small industrial estate.

Interpretation boards, where they exist, are worth a minute of your time. They often name the line, its opening and closure dates, and the goods it carried — information that turns a pleasant stroll into a proper sense of place.

Check access before you set off

Not every disused line is a public right of way, and this is the single most important thing to check. Some are public footpaths or bridleways, some are permissive paths that the landowner can close, some have been reopened as heritage railways or cycle routes, and some sections remain in private hands or were never bought for public use. A path can also stop abruptly where a bridge was removed or a farmer needs the crossing.

• Consult the local highway authority's definitive map of rights of way, or the relevant national park or access authority website, before you travel.
• Look for local closures, diversions, temporary works or seasonal restrictions such as lambing.
• Note the surface: some sections are smooth and firm, others are loose ballast, muddy clay or overgrown.
• Check for tunnels — many are gated, unlit or unsafe, and should not be entered.

Practical points for a good day out

Wear boots with decent tread; ballast and embedded sleeper stubs are uneven and ankles suffer. Take a map and be ready to navigate, because signposting on old lines can be patchy. In summer, cover up against ticks and check yourself afterwards, and carry water, as the exposed embankments offer little shade.

Time your visit for late spring or high summer if flowers and butterflies are your aim, or early autumn for quieter paths and good light on the brickwork. Whatever the season, treat the route with respect: stay on the path where it narrows, take litter home, and leave the orchids, lizards and old bricks exactly where you find them.