The London Overground approach to Clapham Junction is dire - a long 10mph PSR on new but bedded-in trackwork which is virtually straight. The 10mph extends about half a mile out of the platform and just adds yet more journey time to the excrutiatingly slow LORO operation, where trains crawl in and out of stations, have inexplicably long dwell times and barely get above 30mph anywhere.
If I want to get from Clapham Junction to Canada Water (direct train by LORO), it's actually quicker to go to Waterloo and change to the Jubilee line!