Four persons were injured in a collision between the Koraput-Howrah Samaleswari Express and a goods train at Jharsuguda Railway Station, about 110 km from Rourkela, in Odisha early today. Railway police said the incident occurred due to signal overshooting as both the trains started moving in the same direction. The injured were taken to a hospital at Jharsuguda. Samaleswari Express left for its destination after about six hours.