The railway to Jungfrau that makes people linger is a masterpiece of the Swiss. The 7-kilometer tunnel is built in a hard granite mountain. The construction difficulty is unimaginable. This tunnel alone has been repaired for 14 years. The unique gear train is designed to improve the climbing ability, and the colored carriages appear modern and somewhat simple and natural. The train is not travelling very fast, the windows on both sides can be fully opened, and tourists are busy watching the scenery. The Jungfrau in the distance is like a girl wearing a white yarn surrounded by clouds and mist. The green below the mountainside is still the main tone. You can also see the gentle hillside with mountain flowers, the grass is scattered with cattle, and the cow bells echoing in the empty mountains.