The researchers measured temperatures on ballastless track slabs to understand how they change throughout the day. They found that the top surface of the slabs can be up to 16℃ hotter than the local temperature, while the bottom surface can be up to 3℃ hotter. The temperature difference between the top and bottom surfaces is around 10-13℃. They also calculated the warping stresses and deformations of the slabs, with general-slabs having smaller warping deformations than frame-slabs. The maximum warping stresses for general-slabs and frame-slabs were 1.81 MPa and 1.51 MPa respectively.