Which individual is confirmed to NOT have boarded the train?

The individual confirmed to not have boarded the train is Brown. In the context of train operations and passenger lists, there are often records or reports indicating which passengers have checked in or boarded a train. If a person is known to have not boarded, it could be due to various reasons such as missing the train, deciding to travel later, or not having a valid ticket.

In this scenario, confirming that Brown did not board while indicating others did, suggests that there is specific evidence, such as boarding passes or witness statements, that affirm the presence of the other individuals on the train. This highlights the importance of maintaining accurate records and communication in train operations, which is critical for safety and accountability.