Kiul Junction railway station, is one of the major railway junctions in Danapur division of East Central Railway. Kiul is connected to metropolitan areas of India, by the Howrah–Delhi main line via Mugalsarai–Patna route which runs along the historic Grand Trunk Road. The Danapur railway division's main line crosses Sahibganj loop line at the Kiul Junction. The main line crosses the Kiul River between Kiul Junction and Lakhisarai Junction. The Gaya–Kiul line also starts from the Kiul Junction.

The Howrah–New Delhi main line is a railway line connecting Delhi and Kolkata cutting across northern India. The 1,531 km (951 mi) railway line was opened to traffic in 1866 with the introduction of the "1 Down/2 Up Mail" train.