when a person goes through life without ever having a successful relationship those relationships are then added to the fail train. It is possible for one person to ride in multiple cars on a single fail train.
i don't understand why DJ continues to try and date, the girl is just gonna end up on the fail train. Woo Woo!
A transport, form of transport, or metaphorical transport, than fails to produce any kind of useful output.
'OMFG That orc amour is a fail train!' - The amour of that orc has no useful function, and looks retarded
'I had to get on a first great western fail train' - i had to get on a train run by first great western that is unproductive, and late.
'Haha, your train fails, it's a fail train' - your transport tycoon train is costing you large sums of money, and can't reach any stations