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Thermal characteristics were studied for the cross section of plane, convex, and concave rails by channel cooling and surface/channel cooling at repetition rate: 10 and 20 shots/min, respectively. The simulations were all done for 10 sequential shots. During 10 shots time, the peak temperature in three type rails by two cooling approaches is much lower than melting point of rail. Peak temperature in concave rail by two cooling conditions is the highest at the same moment within 10 shots time under identical conditions. Maximal temperature in three type rails by two cooling methods, all increases exponentially with time. In light of obtaining lower peak temperature in rail, convex rail is better than plane and concave rail. In terms of avoiding ablation and gouging, surface/channel cooling is better than channel cooling. [ABSTRACT FROM AUTHOR]