It's an island platform in Hornby O gauge and was introduced in 1954 with the station name Trent (the first time the name had been used) and withdrawn in 1957. The fittings at the end allowed ramps to be added or platforms to be joined together.
As regards the name, there had been a number of station names in earlier years, e.g. Windsor and Ripon, and in the case of Ripon it was a major station on the eastern London-Edinburgh line I understand. Presumably, Trent had a similar significance in BR times.
I would be interested to see how the station looks with LGB items as regards scale.