Getting on the train means participating in work or job opportunities.
Buying a ticket but not catching the train shows that you are worried that you have made efforts and expectations, but lost the opportunity of life, missed the development of your work and failed to keep up with the pace of the environment.
Occasionally get off halfway, but the train has already left.
This also means that relaxation in the process of work will make you feel uneasy, worried that you can't grasp life, fall behind, or can't keep up with the needs of environmental changes.
The solution, I think, should not be too nervous and persistent. If you are always worried that the environment will abandon you, or you can't keep up with the changes, then the dream will continue.