* Transportation: If you're talking about the act of traveling by train, the abstract noun could be travel, journey, or transit.
* Formation: If you're talking about a line of people or objects, the abstract noun could be formation, line, or order.
* Training: If you're talking about the process of learning or being taught, the abstract noun could be training, education, or instruction.
To give you a more precise answer, please provide some context about how the word "train" is being used.