The Upper Soane Bridge, connecting Son Nagar and Dehri-on-Sone across the Son River was completed in 1900. The 3,064 metres (10,052 ft) bridge was then the longest bridge in India. Work on the Grand Chord line of East Indian Railway was complete in 1901. It was formally inaugurated in 1907.
A branch line was opened from Son East Bank, as Son Nagar was then known, to Daltonganj in 1902. 
Son Nagar is expected to be connected with Ludhiana as part of the Eastern Corridor. The primary feeder routes for this will be from Son Nagar to Durgapur via Gomoh, Son Nagar to Tatanagar via Garhwa Road, and Barkakana to Bokaro via Chandrapura.