If running safety cannot be ensured due to broken rail joint components, trains may be stopped or slowed down. This rule was decided based on the condition of broken rail on the safe side, so it may be possible to review it. Therefore, we assembled the track that simulated the joint where the fish plate and fish bolt was damaged, and, conducted static loading laboratory tests considering the train and curve radius conditions. Also, using lateral-force/wheel-load estimation equations under these conditions, the amount of rail misalignment in the left and right direction at joint was estimated. Train operation under broken rail joint components was reviewed by comparing these estimated values and a standard value.