A Western Cape farmer swears by old, converted, coal-burning locomotives for heating tunnels, and they cost less than conventional units.
A conventional coal-burning unit for heating tunnels costs about R120 000, which is a large capital outlay in anybody's book, specially in a vegetable-production, under-plastic system where profit margins are relatively low.
Deon Rossouw, of Kilprug near Paarl, found a cheaper alternative when he decided to modify a locomotive for heating his tunnels. That was four
