Questions were raised before Toledo crash over rail safety in a country where train travel has surged by 40%

Spain’s high-speed rail network, the most extensive in Europe and the second largest in the world after China, has long been a point of pride in the country. But Wednesday’s deadly crash – the second in nine months – has recast the spotlight on questions about safety.

Officials said at least 68 people were killed on Wednesday morning after a high-speed train slammed into another that had stopped on the tracks, leading to the derailment of several carriages. The two trains were believed to be carrying 544 passengers.

High-speed service travelling from Madrid to Seville ran into back of another, knocking two carriages off track

• Spain train crash – latest updates

The Spanish prime minister has declared three days of mourning after at least 68 people were killed and dozens more injured in a collision between two high-speed trains in central Spain.

The trains were travelling in the same direction on the line that stretches from the Spanish capital, Madrid, to Seville on Wednesday when one of the trains ran into the tail of the other that had stopped, knocking several carriages off the track.