A person who picks up other people's problems while also carrying their own, because no one cares enough about them to listen to them. Probably also depressed.
I feel like a cargo train, I always listen to everyone but no one ever listens to me
when you go on a massive bender it is also known as being on the cargo train. A group of people are riding the cargo train when they are together for a period of time consisting purely of getting f*cked up.
“Want to go to the cinema on Saturday?” “Nah I can’t, I’ll still be on the cargo train.”