Congress president Mallikarjun Kharge on Friday used the analogy of a train to target the BJP's "unstable" alliance with Bihar Chief Minister Nitish Kumar's JD(U).

Taking potshots at Kumar, who dumped the INDIA bloc and returned to the BJP-led NDA a few months ago, Kharge said that "the so-called double engine in Bihar meets with frequent accidents, causing the train cars to decouple".