Oftentimes, the rider himself might be said to have played a role in causing the injury. For example, if you ran to catch the train and stumbled over equipment left on the platform, causing you to be injured, the court might find that both you and the agency were both negligent. In such cases, you as an injured plaintiff are not necessarily blocked from bringing a case. Instead the court will weigh your negligence with the negligence of the agency in determining an appropriate award.