Official says 37 people injured, as Spain observes three days of mourning for 42 killed in earlier train collision.

Around 300 people were on board one of the trains, which derailed and crashed onto a neighboring track

Authorities have deployed mobile intensive care units to the crash site near Adamuz, where 25 people are injured.

Dozens of people wounded in the crash in Cordoba province.

It is not yet known what caused the accident