Celebrations for The Queen's birthday will be taking place all over west London this week, with the monarch turning 90 on Thursday April 21.
And as part of the celebrations, the LMS Jubilee Class 5699 Galatea steam train was due to chug through London and Surrey during the day.
However, it was announced on Wednesday (April 20) that the iconic steam train had developed a fault and would therefore not be available on the day. A vintage diesel train will replace it.
The Galatea train was itself a substitute after the original Royal Lizzie locomotive was withdrawn due to complications with its repair.
The double-headed diesel train - Number 37 and 47 - will leave London Victoria on Thursday - the Queen's actual birthday.
Passengers on board the luxury Cathedrals Express tour will pass landmarks including Runnymede, Brooklands Museum, Chertsey Abbey, Royal Holloway University, Chilworth Manor, the River Wey, Box Hill and Gatton Park.
Train time schedule
The vintage diesel train will leave London Victoria at 10.10am on National Rail before returning to the same spot at 2.05pm.
London Victoria: Arrives 9.42am, leaves 10.12am from Platform 2
Grosvenor Bridge Junction: 10.17am
Stewarts Lane Junction: 10.21am
Longhedge Junction: 10.25am
Latchmere Junction: 10.28am
Kensington (Olympia): 10.35am
Mitre Bridge Junction: 10.42am
Willesden SW Sidings: 10.45am
Acton Wells Junction: 10.47am
South Acton Junction: 10.54am
Kew East Junction: 10.58am
Brentford : 11.02am
Hounslow : 11.07am
Feltham Junction: 11.10am
Virginia Water: 11.28am
Addlestone Junction: 11.38am
Byfleet and New Haw: 11.52am
Woking Junction: 12.04pm
Shalford Junction: 12.16pm
Shalford (water loco): 12.20pm
Stoats Nest Junction: 1.22pm
East Croydon: 1.28pm
Clapham Junction: 1.39pm
Pouparts Junction: 1.40pm
Longhedge Junction: 1.43pm
Stewarts Lane Junction: 1.55pm
Grosvenor Bridge Junction: 1.58pm
London Victoria: Arrives 2.05pm on Platform 2
If you manage to catch a glimpse of the train, don't forget to send your videos and pictures to firstname.lastname@example.org or Tweet @WhatsOnGWL.