The 15719 / 20 Katihar - Siliguri Junction Intercity Express is an express train belonging to Indian Railways Northeast Frontier Railway that runs between Katihar Junction of Bihar and Siliguri Junction of West Bengal in India.

It operates as train number 15719 from Platform 7 of Katihar Junction and reaches Platform 3 of Siliguri Junction and as train number 15720 in the reverse direction serving the states of Bihar & West Bengal.

The 15719 / 20 Katihar - Siliguri Junction Intercity Express has ten general unreserved & two SLR (seating with luggage rake) coaches.

As the average speed of the train is lower than 55 km/h (34 mph), as per railway rules, its fare doesn't includes a Superfast surcharge.

On 10 May 2017, at 4:30 am Siliguri Katihar Intercity Express travelling from Katihar towards Siliguri Junction hits and kills an elephant between Bagdogra and Naksalbari in Darjeeling district of West Bengal.