LIMA — Hundreds of tourists were evacuated Wednesday as rail services resumed to and from Peru's Inca citadel of Machu Picchu a day after a head-on collision between two trains killed one person and injured 40. About 700 Peruvian visitors and 1,300 foreigners of various nationalities had been stranded in the town of Aguas Calientes since Tuesday's lunchtime crash suspended train services. Train operator PeruRail said services were slowly resuming Wednesday to and from the archaeological site that receives about 4,500 visitors on average each day. Most visitors take a train and a bus to reach the UNESCO World Heritage Site high in the Andes mountains. On Tuesday, a train operated by PeruRail collided head-on with another belonging to Inca Rail on the single track that links the town of Ollantaytambo with Machu Picchu. The conductor of one of the trains was killed, and 40 people were injured, according to authorities. Government official Ernesto Alvarez told RPP radio two of the injured remained in hospital Wednesday. Human error is believed to have caused the crash. "It appears that one of