Timetables released...
https://kesr.org.uk/50th-anniversary-gala/
The timetables confirm that (subject to availability) the locos in use are expected to be:
BR 4MT 2-6-0 No.76017
SR U class 2-6-0 No.31806
LB&SCR A1X (Terrier) 0-6-0T No.2678
Hunslet 0-6-0ST No.15 'Hastings'
Hunslet 'Austerity' 0-6-0ST No.25 'Northiam' and/or WD75008 'Swiftsure'
Ruston Hornsby 0-6-0DE 'Rowntree No.1' on 'driver for a tenner' duties at Tenterden
BR 7MT 4-6-2 No.70000 'Britannia' at Robertsbridge
GBRf class 73/1 (not specified) at Robertsbridge
Also from Railway Hub & the Rother Valley Railway website, another GBRf loco will be on display at Robertsbridge - class 66 No.66718 'Sir Peter Hendy CBE'.
http://rvrailway.blogspot.com/
Tony