Figure 1
A flowchart illustrating the systematic review process for selecting articles on railway track geometry measurement and quality assessment. The process begins with identifying 50,708 records through Web of Science. The first removal step excludes non-English publications, conference abstracts, editorials, book chapters, studies not addressing railway track geometry measurement or quality assessment, and studies focusing solely on tramways or light rail. This step excludes 40,254 records, leaving 10,504 full-text articles for assessment. The second removal step excludes articles with no original measurement or assessment data, duplicate publications of the same dataset, and full texts that are unavailable. This step excludes 5,096 articles, resulting in 5,408 articles included in the final review.PRISMA-style flow diagram. Source: Authors’ own work