This was not the picture I was anticipating! 47705 & 50023 Howe approach Didcot North Junction on 6 May 1990 with the 1F35 09:30 Oxford to Paddington Network SouthEast service. I'm not sure whether 50023 had failed, or if this was just a positioning move. At the time I was really annoyed that the 50 was not leading, but over two decades later it does have some novelty value.