Initially media reports suggested the train had been stolen by a 20-year-old cleaning woman; however, the train owner Storstockholms Lokaltrafik and operator Arriva spokespeople later apologised for this explanation and suggested that it was only ever an initial hypothesis, which they should not have shared with the media in such a way.
As of 20 January 2013, the cleaner's union, SEKO, was reportedly considering legal action for defamation on her behalf.

Two weeks after the accident the cleaner claimed not to remember anything about the incident.
The cleaner was cleared of all suspicion by the prosecutor's office on 18 January 2013.
The prosecutor alleged that a number of "unfortunate circumstances" and "a number of serious safety breaches on the train and where it was parked" had led to the crash.
The investigation was reported to be considering whether or not any laws had been broken in the accident.

The remaining train car was removed from the house on 28 January, nearly two weeks after the crash occurred.
The stretch of the railway between Neglinge and Saltsjöbaden was closed for maintenance work until mid-September 2013.

On 5 May 2014 the Swedish Accident Investigation Authority published  its final report absolving the injured woman of all responsibility.

The report states that the "dead man's switch" had been secured in its depressed position with a foreign object, leaving the train stationary with brakes released and the power control lever in full forward power.
Only the open doors caused the power to be cut off.

As the cleaner had finished, she entered the motorman's cabin as instructed to close the passenger-doors and exit through the cab-door.
Upon closing the doors the power to the traction switched in and the train took off.
Lacking training, the cleaner could find no way to stop the train.
Failure to set points to prevent the train entering the main line made the accident more serious than it would otherwise have been.
Initially media reports suggested the train had been stolen by a 20-year-old cleaning woman; however, the train owner Storstockholms Lokaltrafik and operator Arriva spokespeople later apologised for this explanation and suggested that it was only ever an initial hypothesis, which they should not have shared with the media in such a way. As of 20 January 2013, the cleaner's union, SEKO, was reportedly considering legal action for defamation on her behalf.
Two weeks after the accident the cleaner claimed not to remember anything about the incident. The cleaner was cleared of all suspicion by the prosecutor's office on 18 January 2013. The prosecutor alleged that a number of "unfortunate circumstances" and "a number of serious safety breaches on the train and where it was parked" had led to the crash. The investigation was reported to be considering whether or not any laws had been broken in the accident.
The remaining train car was removed from the house on 28 January, nearly two weeks after the crash occurred. The stretch of the railway between Neglinge and Saltsjöbaden was closed for maintenance work until mid-September 2013.
On 5 May 2014 the Swedish Accident Investigation Authority published  its final report absolving the injured woman of all responsibility.
The report states that the "dead man's switch" had been secured in its depressed position with a foreign object, leaving the train stationary with brakes released and the power control lever in full forward power. Only the open doors caused the power to be cut off.
As the cleaner had finished, she entered the motorman's cabin as instructed to close the passenger-doors and exit through the cab-door. Upon closing the doors the power to the traction switched in and the train took off. Lacking training, the cleaner could find no way to stop the train. Failure to set points to prevent the train entering the main line made the accident more serious than it would otherwise have been.
2013 Saltsjöbanan train crash