In the past, countries, Thailand has brought a BS70A type rail (rail size 70 lb/YD) in principle, the General. The current railway country Thailand Ltd. ("CID"). . Improvement of the main line elevated railway track conditions, appropriate and safe. By gradually replacing the old BS70A type rail (rail size 70 lb/YD) is a new type of BS100A rail (rail size 100 lb/YD). To increase the size of the railroad, the train can make a run at higher speeds, as well as be able to support the weight of the trains that are appropriate to the bus in the future and reduce the maintenance level.
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