Native Americans, Chinese Laborers and the Emigrant Train travelers.
We are first introduced to Stevenson, who will travel far and wide just to check in on his sick lover. With the amount of money he had, he caught an emigrant train to America, where we meet all of the Emigrant Train travelers. They have all come from different places and have a different background, and now they are going to America for a brand new life, but they realize.. they don't always get what they want, they may just go back to having a poor life and living in poverty.
After many days and weeks of harsh travel, we see the Native Americans, who were tourist attractions. They have lived in America way before anyone else has, and now they are being pushed out of their land because of the new society, but keep in mind they had this land first, and they are now being kicked out. They have made multiple revolts to try to damage the train and its tracks, sometimes even planning to kill the workers. Farther down the tracks we start to wonder, who has constructed most of these railroad tracks? That is when we meet the Chinese Laborers, the overachievers who went from shoveling rocks out of the tracks