Castleford (don't recall seeing it mentioned before)
Nah, it is a bay, but there is a loop line round the outside of it (electrfied to the end of the bay, pretty much (and pretty pointlessly!)I always thought platform 3 at Walsall was a through platform
Going on the same theme, I am going to say Oxted, as the bay platform can't cater for terminating trains - a shunt is required before a train starts there. The trains that do terminate there do so in a through platform.Platform 5 at Southampton isn't signalled for passenger use, trains only go in their to stable sometimes.
I mentioned Sutton earlier