In mid—1860s, two railroad companies had a huge job in front of them: building the transcontinental railroad. The railroad would run from east to west across the United States. As the grueling work began, there were many choices to make. Now the choices are yours. Would you rather blast rock to lay track in the Sierra Nevada mountain range or build bridges across raging rivers in the Great Plains? Would you rather sleep in a cold mountain tunnel or in a camp infested with bedbugs and rats? It's your turn to pick this or that!