By Pietro Lombardi and Corina Pons MADRID, Jan 23 (Reuters) - A series of accidents in one week on Spain's railways, including one of the deadliest in Europe, has left the country reeling and put the spotlight on whether investment to maintain the network is keeping pace with surging passenger demand.

The collision occurred near Adamuz on Sunday night.

Spanish police said Monday that at least 39 people died in the a high-speed train collision Sunday in southern Spain and rescue efforts were continuing.

Crews were working to retrieve bodies after two high-speed trains derailed in southern Spain. The regional authorities said 41 people were hospitalized, with a dozen of them in intensive care.

The black-and-white pooch bolted Sunday in the aftermath of the high-speed train crash in southern Spain that killed at least 45 people.