47319 passes Llandevenny on 21 October 1985 with the Mondays only 6B79 07:10 Abercwmboi Phurnacite Plant to Severn Tunnel Junction loaded vacuum braked coal wagons. This was running 80 minutes late. Phurnacite is a smokeless fuel made from compressed anthracite dust, which although marketed as being a cleaner alternative to ordinary coal, caused a tremendous amount of pollution during its manufacture. The Abercwmboi plant (which closed in 1990) was infamous for the sulphurous smoke that filled the local valley.