 This paper proposes a new methodology for constructing railway bridges using prefabricated composite girders with an innovative girder-toot deck connection. This connection allows for easier construction as it eliminates interference during on-site processes. A prototype of the prefabricated composite girders was designed and tested to ensure its structural performance. The results showed that the connection satisfies the interface shear criteria according to both conventional and plastic approaches. Additionally, the flexural performance was ensured and can be used for railway bridges. This article was authored by Hung Tan Diep, Ji Ho Moon, and Byung H Choi.