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More than 70 ambulances were scrambled to the scene - authorities say the final number of fatalities is still being counted.
A train heading from Giza to Fayoum - south of Cairo - collided into the back of a service heading from Cairo to Aswan in the south, which is believed to have been stationary, according to Egypt's Public Prosecution Office.
The cause of the crash is yet to be officially determined and prosecutors have launched an investigation. Our reporter writes the site of the collision has a long history of rail disasters.
Images and footage from the scene show several derailed passenger carriages overturned along the tracks - you can watch that below.We're now ending our live coverage, you can keep up to date in our news story.
At least a dozen people have died and dozens are injured after a train collision in al-Ayyat in Egypt's Giza governorate, the local health ministry says
A train driver is among those killed, the ministry adds - it's not yet clear what caused the collision
More than 70 ambulances have been deployed to the scene, officials say, with at least 112 people thought to have sustained injuries
Three hospitals are being used to treat the wounded, the health ministry says in its statement
The two trains involved in Sunday's collision serve very different journeys – but both are important transport links for ordinary Egyptians.
The first was travelling to Fayoum, around 100km (62 miles) from Cairo, while the second was heading south to Aswan, nearly 900km (559 miles) away.
Both services are used largely by lower-income passengers, for whom train travel is one of the most affordable ways to get around the country. Tickets for the shorter journey cost less than $1, while the longer trip to Aswan costs less than $10.
Getting eyewitness accounts and personal testimonies can take time.
Many passengers on these services come from poorer communities and may not own smartphones, meaning photographs, videos and first-hand accounts of what happened can take longer to eme
The office says that after an inspection of the scene, and speaking to eyewitnesses, they have determined that the front of the train travelling from Giza to Fayoum crashed into the back of the Cairo-Aswan rail service.
It adds that the train in front (Cairo-Aswan service) had stopped on the tracks. Both trains were heading in the same direction, the statement says.
On the number of deaths, the office says the final number of fatalities and injuries is still being counted but initial estimates say a dozen people, including the driver of the Giza to Fayoum train, died and 114 have been injured.
This figure differs slightly from the latest update from the country's health ministry, who say 112 people have been injured.