Determine the Transition Curve Length of the Railway Line for Mixed Passenger and Freight Traffic with Speed of 250 km/h in Turkey

Research purposes:The transmeridional railway lines in turkey intends to 180 ~ 250 km / h target speed,mixed passenger and freight traffic,while there is not the standard of mixed passenger and freight traffic above 200 km/h in china,the paper focuses on the transition curve length of the railway line for mixed passenger and freight traffic with speed of 250 km/h. Research conclusions:(1)The transition curve length of the railway line for mixed passenger and freight traffic with speed of 250 km/h need consider the unbalanced rate of lateral acceleration slope and rate of superelevation slope.(2)When the radius of curve is certain,the superelevation is greater with the higher speed;when the speed of the high-speed train traffic is certain,the value of the design superelevation is the main factor which determines transition curve length.(3)The mixed passenger and freight traffic with speed of 250 km/h need consider the comfort and the safety of the high-speed train and the low-speed train,the value of design superelevation is smaller than the passenger dedicated line,and the transition curve length is shorter.