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For avoidance of doubt I assume the reason that this is bollox is because of those 27,000 seats between Manchester and London a significant proportion of those are made up of people who either travel from Manchester and get off before London or are people who get on at an intermediary station...

Well there is the argument that for all the HS2 cuttings and tunnels it still doesn't reduce the local opposition. But they do reduce all the opportunities for local administrative malfeasance. The argument for viaducts is that whilst they might be visible they also actually reduce the impact...

Typical motor behaviour is to be torque limited up to a certain point then power limited beyond that point, eventually back EMF will start rising and power will drop off as RPM increases, see these torque curves for a Tesla motor. The point is that the class 331 doesn't have a drive train...

Looking at the masses and power outputs for that model suggests that max acceleration drops off at 23mph with an empty train, mass is 157 tonnes power is 1760KW. With BEMU my 5 car IET based BEMU design study would have 22.5MW and mass 243 tonnes, and accelerate at 1.3ms/s until it hit 125mph+...

A minor hobby horse of mine, eventually all trains will be BEMUs because they allow higher performance than a train limited by the current a OHLE can deliver. A BEMU will be able to accelerate like a tube train all the way up to 100mph, the contexts of metroisation this means that you can get...

Reasonable, however as a approximation a freight path tends to take two or more passenger paths off so in that circumstances we probably only need 10's of passengers on a train to make passenger path more valuable from a capacity stand point. Also with relaxed planning requirements passenger...

Or build the stations Barcelona Line 9 style so that they aren't particularly expensive. If we could build at cost anything like they can in Spain virtually all projects would be affordable.

Pretty simple do an economic assessment of freight trains vs passenger trains and chuck the one that loses off the tracks. A passenger train can take hundreds of cars off the roads a freight train takes 30 lorries off, an HGV is only worth 2 cars from a congestion stand point.

Is there any particular reason why the driver couldn't use a web cam mounted further back on the train to view the signal? The instal cost for this would be pretty negligible compared to doing civil work on platforms. The camera would only need to be a COTS system as it's not directly plugging...

Or we could just use LFP or eventually sodium ion types that are cheap as chips, mass produced and available in variants that have 10,000 cycles lifetime. When they fall down we can then replace them with batteries that are cheaper and last longer ad infinitum. I used to work somewhere where we...

Further developments and some better investigative journalism on the Ebbsfleet jumping spiders. It turns out that the land that Natural England designated as an SSSI which has stopped the development of Ebbsfleet didn't even have any environmental value and was only covered due to Natural...

There are plenty of ways to spot check or even continuously check whether a guard is doing their basic job. E.g. comparing scans to footfall or movements through barriers or just “mystery shoppers”. The other alternative would just be to put ticket barriers everywhere.

I very deliberately used worker compensation as the metric to do the inflation calculation as for a project of this nature worker’s salaries are likely to be the big cost. Using RPI to value a large project from a long time ago gives you results like suggesting that George Stephenson built a...

The economics of pumped storage is being massively challenged by batteries especially once you factor in the Wrights Law (observation) effects that mean that batteries will be a lot cheaper by the time any pumped storage plant actually goes into service. Dinorwig cost about £9bn in today’s...

The general point is reasonable, however the more specific point is that battery trains fundamentally undermine the need for electrification and are straight up better trains than EMUs. Thus the better answer would be to get GBR to plan the network around what battery train could do not what...

Can someone explain this, looking at the plans OOC has 6 HS2 platforms, Tokyo Central has 6 Tokaido Shinkansen platforms, the Tokaido Shinkansen manages to run 13 trains per hour to Shin Osaka. I've heard answers like the Japanese get off trains faster and they clean the trains really quickly...

In the fullness of time it will be interesting to see if we can move freight to a BEMU position as well. The actual motor and battery you would need to fit to each wagon would be pretty tiny, something akin to the BYD Seagull (55KW) per rigid section would give you a better power to weight than...

Correct, I was quoting only the efficiency of regen when the brake is engaged. Total recovered energy in typical driving for EVs is similar to a train as cars tend to stop or slow far more frequently than trains.

This whole argument is premised on the idea that charging is slow. The newest BYD cars can charge at a peak of 10C with full charges in less than 10 minutes. We can also oversize the battery so the relative range per minute of charging can be pretty arbitrary and is more likely to be...

For a 800 Vs 801 9 car set the diesels add 18 tonnes to a 420 tonne train so less than 5% additional weight. The 5 car 800 is also the same weight as a 5 car class 397 EMU so the design is not particularly heavy compared to other EMU's. 1754001997 That seems very low, cars typically manage 70+%