Final answer:
In an atlas, the symbol that looks like train tracks represents actual railway lines, indicating train routes on the map.
Step-by-step explanation:
The symbol in an atlas that looks like train tracks represents actual railway lines. These symbols are used to indicate where train routes are located on the map. Just like roads and highways, railways are an important part of transportation infrastructure and are commonly included in geographic maps to aid navigation and provide a comprehensive overview of an area's transportation networks. In addition to their practical use, these symbols can also be part of larger symbolic representations in different contexts, such as art or propaganda, where they might signify progress, direction, or a journey.