srw
It's a bit more complicated than that...
Over the 30-odd years, rail freight in the UK has barely changed - apart from the fact that the amount of coal moved has tanked very recently as we've shut down coal-fired power stations. There's been an increase in non-coal freight recently. The slack in the system available from the fall in coal transport can't, I suspect, be easily taken up by non-coal, because that would need more investment.
https://en.wikipedia.org/wiki/Rail_freight_in_Great_Britain
https://www.gov.uk/government/uploa...597/domestic-road-freight-statistics-2016.pdf
And the amount moved by the road is about 20 times larger. (These stats are in absolute tonnes)
http://www.metadyne.co.uk/D_ml_freight_km.html
The amount of freight moved by rail has barely changed since the early 1970s - after a 50% decline since the 1950s. Since the 1950s, the amount of freight on the roads has gone up by a factor of 20. (These stats are in tonne-kilometres).
For all that the sentimentalist in me would love to see a massive increase in rail freight, the realist recognises that that would require far more infrastructure investment than is going to happen. Road freight is here to say, so we might as well make it as safe and as efficient as we possibly can.