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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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    Note that systems with DC traction supply use regenerative braking, and there is no equivalent of that for a diesel  system (or a steam one for that matter). With modern inverters that recovered DC can be returned to the grid. In terms of energy use, and brake wear, long term electric trains win hands down, more so where it is hilly or lots of stop and start. The payback time is longer, as the infrastructure effort of HV lines and substations is greater.

    Once we stop using fossil fuel for anything but emergency electricity, (and here in the UK already, on a good day up to 20% is wind,  only about 5% today though )  then we are on to a multiple winner.


    I am not sure if you have seen many of  these (portable solar augmented gensets) at the roadside round your way just yet, but even for things like roadworks and building sites, it is very clear that the days of the conventional diesel genset are numbered, and the pressure is to lower consumption as much as possible.
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  • 0
    Note that systems with DC traction supply use regenerative braking, and there is no equivalent of that for a diesel  system (or a steam one for that matter). With modern inverters that recovered DC can be returned to the grid. In terms of energy use, and brake wear, long term electric trains win hands down, more so where it is hilly or lots of stop and start. The payback time is longer, as the infrastructure effort of HV lines and substations is greater.

    Once we stop using fossil fuel for anything but emergency electricity, (and here in the UK already, on a good day up to 20% is wind,  only about 5% today though )  then we are on to a multiple winner.


    I am not sure if you have seen many of  these (portable solar augmented gensets) at the roadside round your way just yet, but even for things like roadworks and building sites, it is very clear that the days of the conventional diesel genset are numbered, and the pressure is to lower consumption as much as possible.
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