The Tunnel of Love at Klevan is a stretch of working freight railway in the Rivne oblast of northwestern Ukraine whose trees have been trimmed by the passing wagons into a green arch matching their width and height, a corridor of leaves three kilometres long between the village and a fibreboard factory, and it is walked along the rails between the three trains a day, best in June, when the canopy is densest, and again in October, when it turns copper. The line was laid through a plantation of trees that grew over it, and the wagons, brushing the branches on both sides three times a day, keep the arch shaved to their own shape, so that for a few hundred metres near the middle the branches meet overhead with no sky showing at all and the light on the rails goes green; guides will say Soviet planners planted the trees to hide military trains from aircraft, a Cold War story nobody can prove, and the promise that a couple walking through hand in hand will get their wish sounds like old village folklore but is younger than the photographs that made the place famous online around 2011. The train inches through at walking pace, and the walkers stand clear against the leaves.
By mid-October the green has gone over to gold and rust, fallen leaves bury the sleepers and the rails run as two dark lines through colour, thinning week by week until by November it is a bare railway again, and from May the trees knit shut over the rails into the continuous vault that is densest through June. Nothing protects the tunnel, since it exists only as long as the factory keeps sending its trains and the branches keep being cut, and the war has closed the region to most visitors. Klevan itself has a ruined castle, and Rivne is half an hour away. The Tunnel of Love is a railway that a factory keeps green, and the train is the gardener.