The purpose of this thesis is to study the revolution in communications with the centralization of state ในสยาม between BC.2435-2475 study. Development of state power, more and more from the importance of speed through the process of 2 level is to separate out of the transportation and communication And changed the format of transportation land is the railway.The speed of the train became the political cost of the government. And transportation costs between Bangkok and remote area down. Increase economic gather into Bangkok implicitly
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