This is one problem that has sent train drivers scurrying for cover -- a monkey that has attacked three of them in Bihar's West Champaran district after a train overran another monkey.

The monkey has attacked the drivers near the Valmiki Nagar railway station "to take revenge for the death of one of its siblings", IANS quoted AK Jha, a railway official, as saying.

Jha said the monkey was killed when it came under the wheels of a goods train last week, triggering a spate of attacks by the rogue monkey.

A driver of a goods train was attacked on Saturday by the monkey. He had to be rescued by railway officials.

The monkey attacked another goods train driver but he was thankfully able to lock himself in the engine cabin.

"Another goods train driver attacked by the monkey flashed a distress message on his walkie talkie to the station staff to rescue him," Jha said.

Now, goods train drivers have been asked to be alert when they stop their trains at the station.