Turning to freight on the axis more generally, allowing for the fact that bulk trains (like bulk lorries) are only loaded in one direction there can hardly be any dispute that 2,000+ tonnes of limestone and associated products are generating a lot of economic, environmental and safety benefits if they go by rail compared to sending the traffic by road, especially in an area with no motorways, virtually no dual carriageways and many settlements lacking bypasses. The days of capacity hungry 'pick-up' goods trains stopping frequently to shunt a handful of wagons at wayside stations are long gone.
Much of this traffic probably wouldn't exist if the railway was not providing highly subsidised means of doing it.
Aggregates is an extremely low value commodity, shipping it long distances by road simply would not be economic.
What would likely happen is quarries would open closer to the users and the tonne-km of aggregate traffic would fall.
The British Geological Survey did
extensive studies on this about 15 years ago and concluded that underground mining of aggregate over much of the country was only slightly more expensive than rail shipment from more distant quarries.
If rail wasn't shipping it, the traffic would probably not exist at all, not shift to road.
Or sea shipping from coastal "superquarries" would triumph, depending on how close the destination was to the coast.
EDIT:
The costs are apparently similar for 30 miles by road, 100 miles by rail or 1000 miles by sea.
I don't understand the suggestion that freight track access charges are 'subsidised'. I was under the impression that variable track access charges for all types of train/vehicle are calculated using well-established industry models (even if contractually 'established' by the ORR as part of the Periodic Review cycle). These have become more sophisticated over the years with greater understanding of the effects of speed, axle load, fatigue loading of structures, low-track-force bogies and so on. Similar vehicles will be charged similar amounts, e.g. a Class 68 on a Chiltern passenger train and a Class 68 on an intermodal. Ditto a 4-car parcels EMU and an equivalent 4-car passenger EMU. Obviously the variable charge for a 102-tonne bulk wagon is higher than for a lighter Mark IV passenger coach at similar speeds. All operators generally pay their variable charges (subject to occasional rebates from Network Rail for things like charity events or new freight trials perhaps).
Freight
access charges paid to Network Rail (pg184/214) amounted to £53m in the last financial year, up from £11m in the previous year.
Franchised passenger access charges were £2851m and £2221m respectively.
To quote the
ORR website:
The ICC for freight services recovers a proportion of Network Rail’s freight fixed costs. It is based on an assessment of what contribution to fixed network costs each freight market segment can bear (2.5 for further detail).
IN other words, charges are set based on an assesment of how much money the freight operator can bear to pay. It is not really related to the actual costs incurred as a result of the operation.
The economics of the railfreight industry are such that the charges are very small.
In addition there is a large component of fixed track access charges that is basically funded by DfT (or devolved administrations) and not really relevant to the allocation of individual paths even if it notionally passes through TOC accounts.
I don't think it is reasonable to exclude the £8bn being paid to Network Rail by the state each year from the discussion of costs, although it is not really relevant here.
That money only has to be paid because of a political decision to deliberately low ball access charges to users of the rail network.
EDIT
However, I agree that this is not particularly relevant to the task at hand.
The main reason Manchester Sheffield is so slow and problematic is not really the aggregate trains, although I doubt they help.