In article , Mark Brader
writes
I was reviewing something and realized I was unsure about the
Stonebridge Park closure in 1999. Here's what I currently have:
[...]
Underground News does. This is covered in the December 1999 issue.

Thanks.

UN merely gives a southern terminus of "Silverlink Metro services".
If this means trains to Watford Junction,

That's Metro, yes.

It also says that Silverlink County trains made extra stops at
Queen's Park and Wembley Central during the work. I suppose those
were on the main line.

Indeed - County are the trains from Northampton, Bletchley, etc.

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