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HS2 railway

CliveS
We would all agree that an express link fro London to Birmingham and Manchester would be of great benefit BUT do we have to electrify the entire length of track or just the parts inside city boundaries. 

We can half the construction/infrastructure cost if we use diesel electric trains cross country and convert to electric only inside the city. 

This is environmentally friendly as power stations are only 60% efficient at best and mostly use gas at normal/peak times anyway; isn't it ??
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    Then I last looked, the 5000 litre price for red diesel fuel was 57-60p a litre depending on how soon and where you want it delivered.

    The whole sale electricity price averages about £70 per megawatt hour, thought the domestic rate for small users is about double that.

    (Railways are not small users....)


    so 120 litres of fuel has the same bulk cost as megawatt hour or so at wholesale prices.

    If we ever get to a time when the price of electricity per kWhr is less than the price of a quarter of a litre of diesel then we should review the situation.  




    Right now it is already less, nearer  half in fact, though from what I know of generator efficiencies, you will be hard pushed to generate electricity from Diesel at that rate, except if the generator is fully loaded all the time, - on a fully loaded set 1MW might on a good day be 250 litres  per hour, as you suggest,  but sadly at half load, the fuel consumption falls to  perhaps 3/4. Inverter gensets do better, as you can allow the revs to fall at part load.



     


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  • 0
    Then I last looked, the 5000 litre price for red diesel fuel was 57-60p a litre depending on how soon and where you want it delivered.

    The whole sale electricity price averages about £70 per megawatt hour, thought the domestic rate for small users is about double that.

    (Railways are not small users....)


    so 120 litres of fuel has the same bulk cost as megawatt hour or so at wholesale prices.

    If we ever get to a time when the price of electricity per kWhr is less than the price of a quarter of a litre of diesel then we should review the situation.  




    Right now it is already less, nearer  half in fact, though from what I know of generator efficiencies, you will be hard pushed to generate electricity from Diesel at that rate, except if the generator is fully loaded all the time, - on a fully loaded set 1MW might on a good day be 250 litres  per hour, as you suggest,  but sadly at half load, the fuel consumption falls to  perhaps 3/4. Inverter gensets do better, as you can allow the revs to fall at part load.



     


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