The idea of building another platform at Brixton station on the clapham high st to denmark hill line has been repeatedly suggested, and not too long ago it looked like it might happen. Sadly it never did. It seems like such a waste - the line literally runs right by Brixton station already, and a stop there would link nicely with the Tube and Herne Hill lines, plus provide access to Brixton market, shops, bars, etc. Oh well.