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**Review of the Atmosphere Along Both Sides of Train No. 51 from Mae Tan Noi to Khun Tan Station**
Express Train No. 51 is a legendary northern route that provides a beautiful natural view experience along the way, especially the section from **Mae Tan Noi Station** to **Khun Tan Station**, which is full of diverse landscapes, including steep mountains, dense forests, railway tunnels, and old communities. Let's take a look at the highlights of the atmosphere along both sides of this section.
### . **Mae Tan Noi Station: Spectacular S-curve**
Mae Tan Noi Station is the starting point of the excitement with **a clearly sharp S-curve** of the railway, allowing a wide view of the entire train. The surrounding atmosphere is surrounded by hills and forests. In the early morning, there is often a thin layer of fog floating above the train tracks, creating an image that looks like something out of a fairy tale. In addition, this station is also the point where the train must add a locomotive to climb up to Doi Khun Tan. This is an engineering challenge.
### . **Mountainside route: dense forest and fog**
From Mae Tan Noi, the train gradually climbs to higher ground. The atmosphere on both sides of the road changes into a lush rainforest, covered with large trees, allowing only a sliver of sunlight to pass through. In the early morning or late rainy season, early winter, there is often **thick fog** floating like a sea of fog, especially in **Doi Khun Tan National Park**, which is surrounded by pine forests and high-angle views.
### . **Khun Tan Tunnel: The longest railway tunnel in Thailand**
The highlight is passing through **Khun Tan Tunnel**, which is 1,352 meters long and is the longest tunnel in Thailand. It was built by the Germans during World War I. Inside the tunnel, it is pitch black, but once you exit, you will see the view of rice fields and small villages in the middle of the valley, contrasting with the green forest.
### Summary of the overall atmosphere
Traveling by train 51 from Mae Tan Noi to Khun Tan is not only a route, but also a perfect nature tourism. Passengers will experience the beauty of the forest, historical tunnels, old communities, and railway engineering heritage. The most important thing is the peaceful atmosphere and the cool air blowing through the train window all the way.
**Additional advice:** BK
- The best time: Late rainy season, early winter (November-February) to see the sea of fog and cool air.
- Prepare your camera because the view on both sides changes every minute and there are many beautiful photo spots, such as the S-curve at Mae Tan Noi or the composite bridge before entering Khun Tan.