Had an 18-hr journey from SBC to SC yesterday. Departed by 12429 (the worst Rajdhani) at 20.20. The train was delayed at Mantrayalam Road by 4 hours. Found out that the H1 coach's wheels were jammed and the train was crawling at 50 kmph. The train was taken aside at Raichur at 7 am and the H1 coach was detached at 9.30 pm. The train then departed for SC..reached SC at 14.15, instead of its usual arrival time of 7.30. One horrible journey.