[5] The second one was InterExpress (IEx) 41008 Silesia from Praha hlavní nádraží, pulled by ET22-1053 locomotive;[6] its driver was Tadeusz Mościcki.

94 and continuing with speed of 20 km/h,[7] as the regulations of Polish State Railways permitted, in order to safely stop the train if danger was spotted by the driver.

It was also running late that day, with 6:04 am being its planned arrival time at Warszawa Zachodnia.

A local resident, who voluntarily testified during the proceedings, said that a signal located between Pruszków and Ursus changed every few seconds.

[13] The PKP investigation said the cause of the incident was cross circuit, resulting in signal fault.

[14] As a result of the incident, in early May the prosecutor has requested that Tadeusz Mościcki should be cleared of all charges.

Additionally, the defense claimed that the 1990 crash showed chaos present in Polish State Railways.

The government of Ursus district refused to erect a memorial, explaining that none of the killed lived in Ursus, the district had no money to finance the monument, and that Polish State Railways should come forward with the initiative to commemorate the crash, as it occurred on their land.

[16] On 20 August 2024, a memorial stone was unveiled near the site of accident, commemorating the crash and all 16 victims.