<p>A rock-anchored type anchorage (RATA), a typical form of anchorage, provides robust foundation bearing capacity for suspension bridges by transferring loads on the main cable to the rear anchor plate of tunnels through spatially divergent rock holes. To evaluate the bearing capacity characteristics of the RATA in a railway suspension bridge, a case study with a large-scale field model test was conducted using the RATA of the Xihoumen Rail-cum-Road Bridge as a prototype. The deformation characteristics, failure mode, and safety factor for anchorage body under the main cable load were analyzed. Meanwhile, plastic deformation patterns of the surrounding rock under main cable load were characterized using finite element software. The results show that the RATA constructed on dacite strata with the basic quality grade II can resist seven times the cable loads from suspension bridges, and its creep deformation shows a stable trend even under loads seven times higher than the design load. The failure mode of RATA exhibits a wedge-shaped configuration. The research results provide a reference for the design and construction of a RATA for suspension bridges.</p>