2642 bogie 1 found knocking sound underc ~~~~~ 2642 bogie 1 found knocking sound underc   Checked and found #2642 Bogie 1, A1 & B1 wheel flat >50mm, with thermal crack. Follow up for wheel profiling. Notification to HM: 2510852 Done by: Koh, Sanip (31/07/23)