Jigsaw Puzzle Plot/Quotes

"Here's what's what: They weigh the pros and cons of jumping to conclusions when considering a caper with almost twenty lead characters that spans centuries. He takes a bullet to the head. A sharp looking man loses a few fingers for a few seconds. She takes a dip. They don't need luck to survive an attempted hit on their lives. A turf war is raging. Even with a bloody stump, he would still like to kill the love of his life. He's got a big mouth and a bad habit of killing men with a certain surname. There is still one left. They believe a cover up is called for when corpses start stacking up along the tracks. Friends new, old, and immortal wait at the station. A journey that will soon begin is completed."

—First episode summary of Baccano!. Your task is to make sense of it.