I used to think the high-intensity headlights (such as on this Class 37) became mandatory at the same time as the sectorisation liveries were introduced in the late 80s, but recently I've seen photos of newly refurbished 37/4s on test runs in the mid-80s with the high-intensity headlight clearly visible, and at the same time I've seen pictures from as late as the early 90s of locos in triple-grey Railfreight livery that still had not had these lights fitted.
Were these made mandatory in special circumstances only at first? This could explain why the 37/4s had them from "new" given that they were meant for Scotland and Wales, with lots of hilly lines...
Were these made mandatory in special circumstances only at first? This could explain why the 37/4s had them from "new" given that they were meant for Scotland and Wales, with lots of hilly lines...
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