Can't think of any books about the area off-hand, what is it you want to know about the sidings?
The story is rather complex as, at present, you have the DB Schenker yard called Wembley Yard, which is next to the West Coast Main Line, what is colloquially known as "the Carriage" which is the Alstom depot behind that, Willesden Brent Yard to the south which is not used much these days and the Princess Royal Distribution Centre for the Royal Mail between Willesden Brent Yard and the Euston to Watford local (DC) lines. Further south next to Willesden Junction station is LOROL's Willesden TMD where they not only maintain their fleet of 378s and172s but also look after the odd bit of coaching stock on behalf of various owners.
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