The transcontinental railroad click to select the correct answers. click again to unselect answers. leave the incorrect answers unselected. choose the items that correctly describe an aspect of the building of the first transcontinental railroad. it crossed the rocky mountains. large number of irish immigrants were used in construction going westward. it crossed the appalachian mountains. the union pacific railroad used mostly chinese labor. the central pacific railroad built track from west to east. large numbers of japanese immigrants were used in eastward construction. construction was completed before the end of the civil war. the central pacific and union pacific railroads met at promontory point, utah, completing the project.