Driver failed to close doors on wall side of train as passengers boarded from platform.
The main conceptual idea is that an MTR train captain in Hong Kong was suspended for mistakenly leaving the train doors open on both sides while boarding passengers. Although the captain performed routine checks, this oversight triggered the train's safety system, preventing departure and causing inconvenience to passengers. The incident highlights the importance of meticulous attention to detail and adherence to safety protocols in rail transport.