RPSI Weedkilling Train.  1971.  Charles Friel provides the following details:
This a potato sprayer mounted on a permanent way bogie.  Mark Stanley to the left, William Watson working the pump and Tony Ragg pushing the bogie towards the brown coated bottom of Charles Friel.  Peter Scott in the doorway of his fathers camper van in the shed door.  The green mini belongs to Johnny Glendinning, the white Ford belongs to Tony Ragg.  The RPSI's Fergusson tractor can be seen behind.  One of the bogie Guinness grain vans is in No.2 shed road being gutted and fitted out as a cinema van for the forthcoming Open Day.
Photo by J.Allen