Constable Kishan Pal, a native of Baghpat, was waiting for a train to Ghaziabad when he was attacked, police said.
"Constable (Pal) was shot dead by three armed assailants at Baoli Railway station when he was waiting for a train to Ghaziabad. After the incident, the assailants fled from the spot," SP Baghpat Laxmi Singh said.
Singh said a person, Ajit alias Happu, and two others have been named in the FIR lodged by Pal's family members.