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All right, so after posting that I had to investigate further. :)

It seems my theory about JavaScript and focus was almost correct. The National Rail pages have code like this in them:

Code:
<script type="text/javascript">
window.onload=function(){this.focus(); } 
</script>
...which I think is the trigger for this unusual behaviour.

Here also is a screenshot showing the tab highlighting when this occurs:

Click image for larger version

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David