Graham Farish N 374-992 Mk1 Coach Pack Hunslet-Barclay Weed Killing Train
A pair of BR Mk.1 coaches painted in the livery applied to the weed killing train which operated between Hunslet-Barclay class 20 locomotives, 371-035 and along with water tank wagons 373-786.
The weed killing train maintained a regular 'patrol' of the national rail network applying a sprayed herbicide weed killer to the track to keep weeds and other plants out of the ballast. The coaches conveyed spraying aparatus designed to provide a controlled flow and spread of weed killer. Operators inside the coaches regulated the mixture and activated the spray heads needed to deliver the herbicide to the ballast shoulders and cess (where track workers need to walk and stand to keep clear of passing trains) and to cover a parallel track where needed.
The train was usually formed with a locomotive, cab outermost, at each end of the train so it could be driven easily in either direction.