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| | Railroad Maps of the United States. |
 | | Railroads and the use of steam propulsion developed separately, however, and it was not until the two systems merged that railroads began to flourish. |
 | | This map, annotated to show geological structures along the route of the railroad, is an example of the general survey maps prepared to illustrate progress reports of individual railroads, as well as of specific right-of-way surveys. |
 | | The Railroad Act of 1862 put government support behind the transcontinental railroad and helped create the Union Pacific Railroad (see entry 588), which subsequently joined with the Central Pacific at Promontory, Utah, on May 10, 1869, and signaled the linking of the continent. |
| www.cprr.org /Museum/Maps/Modelski_LOC_1975.html (7033 words) |
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