With the rapid development of cities and continuous progress in rail transit construction, the alignment of newly-built rail transit projects has become increasingly complex. It is inevitable for transition curves at stations in central urban areas to intrude into the end section of effective platforms. Excessive intrusion of transition curves into the scope of effective platforms will directly lower the speed limit standards for curved track sections, restricting train speed increase and the optimization of the overall line travel time. Against this background, this paper thoroughly analyzes the key influencing factors of transition curve intrusion into the length of effective platforms, and determines the controllable and allowable intrusion length in combination with actual operation conditions. On this basis, this paper innovatively puts forward three optimization schemes, namely sectional arrangement of the superelevation gradient for transition curves, reduction of transition curve length, and reduction of curve radius, to increase curve superelevation and further raise the maximum speed limit of curved track sections. Through comprehensive comparison and selection analysis combined with practical engineering cases, the research draws the following conclusion: the scheme of reducing the curve radius is prioritized on the premise of meeting the requirements of relevant specifications; for sections constrained by engineering conditions, the schemes of sectional arrangement of the superelevation gradient for transition curves and reduction of transition curve length can be adopted as alternative options.