Bends and alignment irregularities occur at structure boundaries. They cause not only rails to bend but also tracks to buckle when their magnitudes are large. Therefore, structure boundaries are thought to produce weak points of track structures. The floating ladder track, of which the structure is high-rigidity composite rails supported by vibration-cut devices with low spring constants, can restraint rail bending and track buckling when it is used to bridge structure boundaries. So, the floating ladder track contributes to strengthening track structures effectively under this scenario. This paper reports an analytical study on the behavior of floating ladder track at structure boundaries subjected to temperature changes.