Final answer:
Dr. Constantine's thoughts as a character in 'Murder on the Orient Express' are not outlined in the given excerpts, but he would likely be focused on the facts of the case and the broader implications, consistent with his professional role.
Step-by-step explanation:
Dr. Constantine's thoughts are not directly revealed in 'Murder on the Orient Express.' However, based on the context provided by Agatha Christie's work, we can infer characteristics about him. The excerpts provided do not pertain directly to Dr. Constantine or 'Murder on the Orient Express', but, typically in a detective novel such as this, a character like Dr. Constantine might be primarily concerned with the facts of the case and the possible implications for those involved. This focus on professionalism often highlights the character's concern with justice and the truth, rather than a bias toward a particular individual or a concern for the company's reputation.