Ghost train on the Swanage Railway?

A steam locomotive which won't be running on this track until mid-February pulling three coaches with no passengers.  Groups of people in high-visibility jackets on either side of the track.  Odd, very odd!

This was not a mirage ........ so it must have been a photo shoot.  Anyway, that's how I treated it.

(Poole and its Harbour can be seen in the background.)