This is at Kulem railway station in Goa. Here freights halt for attachment of banker locos at the rear end of the rakes for climbing the Braganza Ghat section and due to technical reasons the caboose attached at the end of the rakes are detached and the guard gets in the banker locos and when the train reaches Castle Rock a new caboose is attached to the freight train.
When lots of cabooses get accumulated at Kulem they are moved up to Castle Rock.