By what economic mechanism is that?
Through enabling a significant increase in the efficiency and therefore productivity of freight transport, which is proven to encourage economic growth.
No the main bottleneck for Felixstowe is the branch to Ipswich which is the only rail route out of the port and single track. Capacity is determined by how many trains can get out of the port.
You’re arguing with the wrong person here. The key constraint was the Felixstowe branch, until NR spent £60m on lengthening the double track section 3 years ago and unlocked significant capacity. Unfortunately it can’t all be used, because of the constraints … in the Ely area.
For this project, the economic benefit of improved freight capacity is far, far more than the economic benefit of additional passenger trains.
There is a chance this is based on a misunderstanding of the situation, if so please correct me.
You’re mostly right. But you do have to bear in mind that in most cases, the right of way was there before the railway, and secondly, legislation requires ‘the railway’, and not the highway authority, to be in charge of the risk.
For the roads, having more vehicles travel over the same infrastructure doesn't trigger a new risk assessment.
for general traffic growth, yes. However if there is a new development nearby whcih could drive significant traffic growth, then that can trigger a risk assessment. Planning Authorities are obliged to consider the output of such an assessment (and potential implications) during the planning process for such developments. There are numerous examples where this has led to level crossing improvement being funded by developers and/or local authorities as a result.
The way I see it, the railway should be allowed to perform the risk assessment both assuming vehicle numbers present at the previous risk assessment
It can and does do this.
Now of course if both the old and new vehicle numbers would require upgrades, then the railway should pay for the upgrades.
Which is what usually happens.
Why?
Because increasing road traffic usually happens very incrementally - a % or two per year. Although there has actually been little growth in road traffic on the ‘minor roads’ network, ie where almost all the highway crossings are. In the year before Covid it was only 15% above 30 years previously. This (almost) translates into the same percentage increase in highway crossing risk.
Whereas increasing rail traffic happens in big lumps - eg going from hourly to half hourly doubles the rail traffic and (broadly) doubles the risk. Similarly the risk assessment is affected by the number of people on the trains, therefore the increase in passenger numbers (until Covid) was also triggering increased risk levels.