Complex sentence: Only the Alstom Metropolis C830 runs on the Circle Line.lately, the C151A is no longer on North South line since it suffered the Worst Disruptions on December 2011 due to the damaged third rail.
Split into simpler sentences: Only the Alstom Metropolis C830 runs on the Circle Line. Lately, the C151A is no longer on North South line since it suffered the Worst Disruptions on December 2011 due to the damaged third rail.