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brennan's Recent Activity

  1. brennan replied to the thread GWR four-cylinder arrangement?.

    Probably one of the reasons that Chapelon's work was abandoned by the senior management and the French railways adopted electrification, presumably paid for by the US of A.

    Jul 10, 2026 at 5:21 PM

  2. brennan replied to the thread North Yorkshire Moors Railway General Discussion.

    Basic thermodynamics. Whilst heat transfer in the boiler is reasonably efficient the open steam cycle used in a locomotive is horribly inefficient. A diesel engine has an efficiency in the order of 30% to 40% then there are transmission losses....

    Jul 9, 2026 at 9:22 AM

  3. brennan replied to the thread North Yorkshire Moors Railway General Discussion.

    Jul 9, 2026 at 8:59 AM

  4. brennan replied to the thread 76077.

    Paraffin overhauls are a thing of the past. Non ferrous material costs in particular are sky high and nobody with the required skills works for the minimum wage. It's still a cheap job compared to having your yacht fixed!

    Jul 6, 2026 at 8:33 AM
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