Carryfast:
Define ‘base loads’.
Do I really need to define it any more precisely? We know the category we’re talking about - movements that occur on a regular schedule in high (i.e. freight train sized) volumes.
When what you’re actually describing is a stated admitted deliberate government policy,of rigging the transport market
You mean regulating the market to prevent undercutting?
to transfer freight,which is already established in being transported ‘efficiently’ by road,onto rail.‘Rigging’ in this case being the artificial imposition of unfair road transport specific taxation and unnecessary restrictions on vehicle dimensions and weights.
There have always been dimensional restrictions on road freight. Just as there are dimensional restrictions on rail freight, particularly in the form of weights and heights (because the alternative is having to replace track more often and risking bridges being knocked over), and the lengths of individual wagons (because of turning circles).
I don’t see why you seem to think this is a kind of “rigging”, as opposed to perfectly reasonable restrictions imposed for infrastructure and safety reasons - you seem to think, like all those with undeveloped thinking and superstitions, that your point is self-evident.
And as I’ve said, the road-transport-specific taxation (presumably you mean road fuel duty) is not necessarily unfair just because it applies only to road transport.
As I’ve said, the rail industry is integrated and pays for its own infrastructure. Under BR, the same firm literally owned everything and paid for everything.
That has never been the case in road transport, and the hordes of two-bit, one-man road haulage operators are as far away from owning and paying for their own infrastructure as can possibly be imagined.
There has to be some other way then to extract the price of infrastructure, and that is by taxation - that is the fundamental role of taxation, to efficiently extract the price of things that would otherwise be difficult or inefficient to charge for (even a toll bar or ticket office at the entrance and exit to every premises would obviously be far more expensive to maintain, enforce, and administer than simply telling petrochemical suppliers to add a price to fuel, which roughly imposes a charge according to the use of the road network, and imposes no further administration burden on fuel users beyond the buying of fuel which they do anyway).
Another perfectly proper function of taxation is to redress market failures (in the sense that the market reaches an equilibrium that is politically unacceptable, or has large economic externalities which are perceived politically but are not priced into the market).
The cheapness of labour in road transport is probably a prime example of this, where a technologically more suitable mode of transport (like rail), may be wholly undercut temporarily by the sheer cheapness of labour in another. The effect of that temporary undercutting may be to completely destroy the economics of a rail system that has high fixed costs and relies on high utilisation, which the government either then has to subsidise until the cheapness of labour in road abates (which it can only afford by raising taxes), or if not subsidised then allow the industry to financially collapse.
On that note exactly what is supposedly so different about a 26-32t rigid pulling a 45 ft drawbar trailer as opposed to tractor unit pulling a 45-50 foot semi trailer.
I think when they looked at it, one of the first things they said was that there would be no motorway parking for such long vehicles. Secondly, approved routes would have to be surveyed and adhered to, and road closures might mean such vehicles were dead-ended. Thirdly, (and perhaps particularly because of the route restrictions) there would be insufficient ability to find full capacity return loads.
And ultimately any attempt at solutions for the above would mean higher taxes on road haulage in one way or another to pay for it, which is another factor bearing on road haulage which you wanted reduced.
Or for that matter why would you think that use of those combined with use of red diesel wouldn’t provide a much better chance of increasing wage levels and terms and conditions for drivers.No surprise that UNITE won’t see it that way like you being lumbered with Socialist dogma that keeps truck drivers second class workers v train drivers. 
The result being that yet again they’ll be left behind in favour of their German counterparts.
youtube.com/watch?v=0xDhKuT1JII
No, I don’t agree that use of red diesel will help anyone, because in the first place the lost taxation will have to be replaced from elsewhere.
More to the point for drivers, the reason for low wages is not high costs!
You don’t seem to have grasped this in my previous post. If the driver is struggling to breathe when trapped under a millstone (which represents market competition and the power of capital versus labour), digging out the ground underneath the driver by eroding costs (which competition also bears upon), will not lead to more room to breathe - the millstone will simply fall under gravity with the driver, exerting the same pressure on the driver’s chest as before, but the price the customer has to pay can now drop a little bit.