The investigation into the Urda incident examines whether Adif used the wrong protocol more times.

The investigation into the Urda train collision is examining whether Adif frequently used an incorrect protocol after a signaling system failure. The order for an AVE train to proceed at normal speed after the LZB system failure is under scrutiny, as it led to a collision with a stationary train, resulting in 69 fatalities. Authorities are reviewing past incidents on the Madrid-Sevilla line to determine if this was a one-time error or a common practice. The Transport Minister noted that LZB failures are relatively stable and common, but emphasized the need for improved safety protocols. Renfe plans to implement stricter measures for train operations during LZB failures, including a maximum speed limit of 40 km/h without LZB support. The train drivers' union has called for mandatory sighting operations when LZB is down, highlighting safety concerns.