Khun Tan railway station

Khun Tan railway station
Khun Tan railway station; สถานีรถไฟขุนตาน
Location	Tha Pladuk Subdistrict, Mae Tha District, Lamphun; Thailand
Operated by	State Railway of Thailand
Line(s)	Northern Line
Platforms	3
Tracks	3
Other information
Station code	ขน.
Services

Khun Tan railway station is a railway station on the Northern Line located in Lamphun Province, Thailand. It is operated by the State Railway of Thailand, and is 683.14 km (424.5 mi) from Bangkok railway station. Khun Tan Railway Station is in the Tha Pladuk Subdistrict, Mae Tha District.

Khun Tan Railway Station is the highest railway station in Thailand, at 578 metres (1,896 ft 4 in) above sea level. Around the railway station is the Doi Khuntan National Park, the reason the station exists, which has bungalows run by the State Railway of Thailand, for visitors' use as well.

Khun Tan tunnel

Khun Tan Tunnel

Two hundred metres from Khun Tan Railway Station, is the Khun Tan Tunnel. It is the longest railway tunnel in Thailand, at 1,352.1 metres (4,436 ft 0 in) in length. Construction took 11 years at a cost of 1.3 million baht. It was finished in 1918.

History

The railway route Bangkok–Chiang Mai had been designed to avoid the Khun Tan Mountains, a barrier between Lampang and Lamphun. The tunnel was built ease trade barriers between the northern and central provinces. Surveys for the tunnel route were started in 1905. Construction began in 1907. First, base pins were set up at a level behind the mountain aligned with the tunnel route so that the tunnel could be blasted to the width needed. Then air compressors were used to drill through the mountain. If these air compressors broke down, then metal chisels were hammered into the rock, explosives inserted and then the rock was blasted to make way for track-laying. The tunnel was finished in 1918 and remains in daily use.

Train services

Special Express Diesel Car No. 7/8 Bangkok- Chiang Mai- Bangkok
Special Express "Uttrawithi" 9/10 Bangkok-Chiang Mai-Bangkok
Special Express 13/14 Bangkok-Chiang Mai-Bangkok
Express 51/52 Bangkok-Chiang Mai-Bangkok
Rapid 109/102 Bangkok-Chiang Mai-Bangkok
Local 407/408 Nakhon Sawan-Chiang Mai-Nakhon Sawan

gollark: The combination of uniformly sized partitions and using the value on the "left" apparently causes bee.

gollark: https://math.stackexchange.com/questions/1803080/if-the-left-riemann-sum-of-a-function-converges-is-the-function-integrable

gollark: It seems to be if you use the WRONG version, is the thing.

gollark: Apparently, if you integrate the "characteristic function of the rational numbers" (1 if rational, 0 otherwise) from 0 to 1, you will attain 1, because x is always rational (because b - a is 1, and all the partitions are the same size), even though it should be 0.

gollark: For another thing, as I found out while reading a complaint by mathematicians about the use of Riemann integrals over gauge integrals, if you always take the point to "sample" as the left/right/center of each partition *and* the thing is evenly divided up into partitions, it's actually wrong in some circumstances.

References

"สาระความรู้วิชาการรถไฟและประวัติศาสตร์รถไฟไทย" [Academic knowledge, train and railway history Thailand]. Rotfaithai.com forums.
"บังกะโลขุนตาน" [Khun Tan Station]. State Railway of Thailand.
State Railway of Thailand. "ประวัติอุโมงค์ขุนตาน และ; การก่อสร้างอุโมงค์ขุนตาน" [Khun Tan Tunnel history; Khun Tan Tunnel Construction] (PDF).

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