Nathanael,
thank you for your work! I shall have to pull/merge that when I get a chance. The reason for the different introduction/retirement dates is to optimise Pak128.Britain-Ex for the new obsolescence handling in Simutrans-Experimental, which means having retirement dates set when the vehicles go out of production, not when they are likely to go out of use (in Simutrans-Standard, there seems to be an inconsistent approach between the two; trains and 'buses seem to use the latter approach, whereas lorries and boats appear to use the approach for which I am aiming).