Abstract
The purpose of this paper is to present the alignment layout and the way of modifying transition curve for better operation of tilting trains. It is based on data from field investigation of all curves in conventional line. In general, all curves have transition parts in the beginning and end of the main curve in order to improve the passenger's comfort. The speed-up of conventional line may need an extention of transition curves. This paper checked out whether the transition curve should be modified or not and how to lengthen it. Then the maximum train speeds in curve prior to and after the modification of transition curve were evaluated.
