Thermal stresses and deformation in straddle track girders can be significant in comparison to dead or live load responses. In present paper, a comparison of current design-code provisions is present. The temperature distributions are obtained by a numerical technique for the solution of the Fourier heat-transfer equation and its boundary conditions. This technique is based on the finite-element method and takes into account the geometry of cross section of the track girder, thermal properties of concrete, and the climatic conditions. A field test is conducted on a track girder to verify the analytical models. The results of a temperature gradient study developed to evaluate design thermal vertical differences for the straddle type track girder are presented. The analysis suggests that straddle track girders are designed for larger temperature gradients than the codes suggested.