About half-a-dozen robbers barged into the train and allegedly robbed Rs 10 lakh contained in a steel box and a walky talky from the guard Jitendra Kumar at gunpoint before jumping out at Harnaut halt, they said.
However, the robbers abandoned the cash-filled heavy box near Cheran thermal power station as they failed to lift the heavy steel box, but walked away with Kumar's walky talky, police said.
The robbers also fired several rounds on the cops who ran behind them in their hot pursuit, they said.
A case has been lodged in this connection and raids are being carried out to nab the robbers, he said.