I use the Cross City line

As the premier, most popular commuter rail artery of Englands' second city, it certainly does deserve a train every ten minutes; the half hourly Sunday service is absolutely shocking for such a well used line in such a large city! Although I have to agree with you that I wish that more of the regional and Intercity services were routed via the Camp Hill line, which would certainly reduce delays and journey times.
The Cross-City line also passes through some of the more affluent, and some of the most pleasant (IMO) areas of Birmingham. Kings Norton, Bourneville, Selly Oak and the area around University are all quite nice places to be, and there are few things I enjoy better than whiling away a peaceful evening drinking in any of the numerous well-tended bars in Selly Oak.
This latest report is turning out to be an excellent read Ivo. My greatest of congratulations to you my fine fellow.
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Additionally, that metal shed on the "up" side of the line north of Warrington Bank Quay station is Warrington Royal Mail Terminal and Regional Distribution Centre, which is served by a number of Royal Mails' class 325 electric postal units each day on the Sheildmuir to Warrington to Willesden run. I spent a fascinating night there the other week loading and unloading York cages on and off the trains (I've now cabbed a 325!) and the lorries. Well, half a night really: I spent 6pm until midnight at the Mail Terminal and midnight 'til 6am drinking whiskey and watching DVDs back at my mates' apartment.

And Warrington truly is an absolute dump. It's on a par with Middlesborough.