"Stop That Train" is a song originally written by Peter Tosh, a member of the legendary reggae group The Wailers. The version by Jerry Garcia Band that you mentioned is a cover of this song. The lyrics express the urgency of wanting to escape from a lonely and unfulfilled life. The narrator feels like a lonely man who has been unsuccessful in teaching people who refuse to understand him. He has tried his best but hasn't been able to find happiness. The repeated plea to "Stop that train, I'm leaving" is a metaphorical way of saying that the narrator wants to break free from his current situation and find a better life elsewhere. The train symbolizes the path he's been on, and he wants to abandon it. It's mentioned that whether he is right or wrong, it won't be too long before he makes his move. The song also touches upon the struggles faced by different people in society. Some travel east, some travel west, trying to do their best, but many are stuck in small places, unable to even find enough food to survive. These lines highlight the inequality and hardship experienced by some, while others are more fortunate. Overall, "Stop That Train" conveys a sense of frustration, longing for change, and a desire for a better life. It encourages listeners to not settle for a life of unhappiness and to take action to seek fulfillment and happiness.