Eight of the dead are children and six women, said Sudhir Kumar Singh, a senior police officer of East Champaran district where the accident took place.
Singh said the railway crossing gate was not closed as the train was passing, leading to the collision with the vehicle known as tempo in India.
The accident also injured two people, senior administrative officer Abhay Kumar Singh told Reuters from the hospital were the injured were admitted.
Prime Minister Narendra Modi sent his condolences to the families of those killed.
India’s creaking railways are known for their poor safety record, something Modi has vowed to fix. In May a passenger train collided with a stationary goods train in Uttar Pradesh, killing at least 40 people and injuring more than 150.