Recent content by TheoBald

Having chewed over my earlier attempt to answer one of the OP's questions I need to correct my opening sentence which stated "such small samples". This is wrong! I should have stated "such small data". The samples are huge, not simply 10 years but 3652 days or ....minutes or ... seconds - the...

I'll start by echoing the above comments on the reliability of statistics drawn from such small samples, and the need to ask whether we're comparing comparable data (passenger kilometres etc). But you prompted me to answer a version of your question for my own interest: "Can the increase in...

No, your 40mph is a speed not acceleration. Impulse = change in momentum: Ft = mv - mu If the lorry is brought to rest uniformly in 1 second, taking your 40mph as 17.9 m/s Force x 1 = 10,000 x 17.9 - 0 179,000 N edit to improve my sums! And if the lorry was brought to uniform rest in 0.5s, the...

I've enjoyed watching progress in a couple of dozen of these videos now and must thank those who provide the links. But I'd like to know if I'm being overly critical with an observation: that over half of the (wo)man hours we're seeing are clearly being wasted. In picture after picture, video...

Again, be careful with raw statistics without their background! (see post 68). If you are taking Tim Jupp's figures as gospel to indicate recent growth, you are being misled by many of them. For example look at Wymondham (8.72% average annual growth from 1998 to 2005). This is massively skewed...

Be careful! Many of these percentages are very misleading, not accurately reflecting recent growth and certainly not as a prediction of the future. Take a look at the graph of the data for St Ives for example. The gradient of the line of best fit, from which the average annual growth rate is...

Thanks for passing this on. A fascinating presentation of a huge volume of data. As I'm sure Mr Jupp would agree, all data needs to be treated sceptically. A clear example is from his graph found by clicking on Pye Corner. I think He has used a logarithmic scale in order to draw the annual...

Does it? On OTT the up line enters the northern tunnel ..... then cleverly exits the southern!

Thanks all for taking the time to help my understanding.

On the Ipswich map many of the station's signals are shown as doubles (circle + quadrant). Main + subsidiary shunt makes sense. Thank you. Gloster - thanks for confirming my undeclared guess re the square + red dot. The way the Felixstowe line recovers from freight delays, sometimes needing to...

Off topic, but thanks to members highlighting the site, I've spent many happy hours watching various diagrams on opentraintimes. The Kings Cross-Cambridge choreography is a personal favourite as the Ely/Lynn fast (1Txx) chases the (too rarely on time) Thameslink (9Sxx), with both hoping to pass...

The ratio for Hertford East to Hertford North? More scenic via Broxbourne, Cambridge and Stevenage (soon to be shortened by adding a third compass point - South). But is a London option shorter? And of course North to East would be marginally longer, being mainly on the outer rails on curves in...

Are you quoting from the energydashboard data? If so, have a look at 9:30 on 16th June - below 1GW (just!). Gridwatch give hourly averages in their monthly graphs which may complicate matters, I can't see what energydashboard data reflects (though I can find your 1.1(5)GW figure on their site...

Leaving aside the concept of generating wind, is this true? A quick look at Gridwatch suggests that wind generated electricity was below 1GW as recently as 22:00 two days ago. And I don't understand how a minimum of even 2GW from wind can be considered enough to help meet our essential needs -...

Am I missing something? If the cross tunnels are 500m apart, passengers will never be more than 250m from the nearest - half the distance claimed in the video.