Not a depot, but the grandaddy of tram works......
https://maps.google.co.uk/maps?q=west+strand&ll=53.763414,-2.722737&spn=0.002749,0.006968&hnear=W+Strand,+Preston+PR1+8UQ,+United+Kingdom&gl=uk&t=h&z=18&layer=c&cbll=53.763339,-2.722715&panoid=oAR1pZuVtN5szGzubVu9bg&cbp=12,211.24,,0,11.02
Dick Kerrs in Preston (now Alstom)
Incidentally, the building to the right houses an excellent model shop called Transport Models....