I've got no problem with what you are saying in essence as of course there will be situations when you might need to use the horn under any of the situations you quote. However, I wouldn't condone you using the horn routinely without good cause in any of those situations either. Like you I would never hesitate to use the horn as a safety device which is it's sole purpose. It's use has been deemed pointless in the situations that have been removed from the rule book. Of course some will continue to do it just like some continue to use both tones at a whistle board even if there is nobody there.
Good cause is down to individual judgement and whether you condone the choice a Driver makes is irrelevant. The Driver has made the decision to sound the horn as they are perfectly entitled to do so within the rules even if it isn't one of the specifically prescribed actions. One of the lines I worked over had Whistle boards removed but as the crossings were off blind bends I continued to sound the horn as I deemed it necessary. Even my boss agreed. The low tone of horn change at W boards was done purely as noise abatement and no safety reasoning put behind it. They said as much at the time and I personally didn't agree with this but there you go. I've had conversations about warning horn use with varying levels of Driver management and they all said my thoughts are perfectly acceptable and sensible. Good enough for me.
Most driver managers are ex drivers. They don't make the rules and don't necessarily interpret them correctly. The rules surrounding foot crossings are very strict and very detailed. Each one is risk assessed and ranked, even the tiny little trails that officially cross the line. Whistle boards are part of that assessment and they are placed at a precise distance from the crossing depending on line speed and viewing. It's very rare for whistle boards to be removed unless it's done by residents (somebody at Ashton Moss must have about 50 in his shed). To be removed officially the crossing must have reduced in ranking due to things like its usage changing (factory closure, access been cut off by other development etc) or the viewing has been improved by the removal of structures or trees, or because some alternative means to cross have been provided. In some cases, the risk assessment has turned up additional risk and they will imposed a "permanent TSR" that brings trains down to a speed that provides a minimum viewing time to a crossing user. They never add whistle boards in this latter case. Some TOCS have their own company rules for certain crossings and will mandate the use of both tones but I'm not sure how legal these are technically. The horn code for a whistle board is universal. The low tone of the horn between the hours of 7-11 (23:00) unless you see somebody there outside those hours. You justifying the use of both tones by using the "any other time necessary" or quoting somebody else's incorrect opinion is neither correct and probably a violation of the use for that reason if you do it routinely at crossings you have done your own misinformed risk assessment on.
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The change was to do with speed over secured points. Used to be 50 all day long if they're secured. Now it's 50 unless you're the first train into the block. If you are the first train you have to do max 15 over them even if they have been secured.
The change is from 15 over any points, switches or swing nosed points to 50 as long as they are clamped and locked. That change to 50 came at the same time as "unless you are the first train through the section".
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Why on earth does this double post prevention system gang up all your posts!!!