My first visit to Didcot Railway Centre to the Metropolitan & Great Western Railway Gala featured three steam locomotives and a steam railmotor in action on both of the site's running lines.
Visiting:

Metropolitan Railway No. 1

Resident:

Railmotor No.93 and trailer No.92
Pannier No. 3650
King No. 6023 'King Edward II'

Mogul No. 5322 was pulled from the lineup at the last minute.