Diesel train vs Car

So it turns out that the car is more environmentally friendly than the train for a family of three or more.  That's one in the eye for enviro-nutters.  It is also one in the eye for this government's completely muddled and irrational environmental and transport policies.  As for the spiralling cost of rail transport... Which reminds me, I have to catch a South West Train today, nothing could fill me with more dread.  And now it turns out I'd better off in the comfort of a car.