Premise

The island of Sodor is in full economic swing. Although it is the only place in England where steam locomotives are in working service as opposed to being heritage attractions, the island still tries to be as efficient and economically viable as possible, showing the world that the days of steam do not have to end on their idyllic island in the Irish sea. Diesels have also been incorporated, but are mostly friendly. Engines are incredibly busy, shunting trucks and hauling freight. The time is set after the events of Season 7, but has many of the characters and locations of Seasons 8-12. The island has plenty of engines to manage the workload, but unbeknownst to them, the prosperity is not to last forever.

The series follows the Unlucky Tug's map from 2021 and does not take anything away, but adds in a few prominent landmarks (the most prominent four being Great Waterton, the abandoned Toryreck mines, the Green Hills Junction, and Culdee Caves). It is also worth noting that the Coastal Run is somewhat merged with the Little Western in this canon. A basic overview of the island's operations is shown below, note that there are also several road/air vehicles such as the Sodor Construction Company, Harold, Bertie etc., as well as rolling stock which are not included (notably Hector, Annie and Clarabel, and Henrietta).

The Main Line
Henry: Goods trains and passengers, all across the Main Line, occasional express duties

Gordon: Regular express and passenger duties, occasional goods duties, all across the Main Line

James: Mixed traffic, goods and passengers, all across the Main Line

Emily: Mixed traffic, goods and passengers, all across the Main Line

Harvey: Steam crane, for use in the case of emergency, resides at Great Waterton but can be dispatched across the island

Murdoch: Heavy goods work, all across the Main Line

Molly: Goods work, in/to/from Crosby Coaling Plant, resides there

Neville: Goods and occasional passenger duties in/to/from Great Waterton, resides there

Rosie: Vicarstown station pilot, occasional duties across the Main Line

Stanley: Great Waterton station pilot, occasional duties across the Main Line

Dennis: Knapford Station pilot, occasional duties across the Main Line

Splatter: Shunter diesel at Crosby Coaling Plant

Ffarquhar Branch Line
Thomas: Passenger and goods duties, all along the branch line

Percy: Passenger, goods, and mail duties, mostly at the tail end of the branch line but sometimes elsewhere

Toby: Small-scale passenger runs and goods work, all along the branch line

Daisy: Passenger and goods duties, all along the branch line

Mavis: Shunter at Ffarquhar Quarry, occasionally allowed elsewhere on the branch

Dodge: Shunter at Ffarquhar Quarry, occasionally allowed elsewhere on the branch

Brendam Branch Line
Edward: Passenger and goods work, occasionally works on the Main Line too, operates all along the branch

BoCo: Goods duties, all along the branch

Bill and Ben: Shunters and goods engines owned by Sodor China Clay, mostly at the tail end of the branch

Salty: Shunter at Brendam Docks, occasionally allowed elsewhere

Derek: Goods engine for Sodor China Clay, mostly at tail end of branch

The Little Western/The Coastal Run
Duck: Passenger and goods work, all along the branch

Donald and Douglas: Passenger and goods work, all along the branch

Oliver: Passenger and goods work, all along the branch

Arthur: Goods engine, mostly at the northern half of the branch line (the Coastal Run)

Peel Godred Branch Line
'Arry and Bert: Shunter and scrap diesels at Sodor Ironworks, rarely leave their home

Kirk Ronan Branch Line
Fergus: Shunter and goods engine at the Sodor Cement Works, but operates all across the branch

Diesel: Goods work, all across the branch

Centre Island Branch Line (Toby's Old Railway)
Flora: Small-scale passenger services across the branch line

Bertram: Tourist rides around Ulfstead Castle

* Toby also sometimes helps out here with passengers and occasional goods work

Skarloey Railway
Skarloey: Goods and passenger work, all across the line

Rheneas: Goods and passenger work, all across the line

Sir Handel: Goods and passenger work, all across the line

Peter Sam: Goods and passenger work, all across the line

Rusty: Maintenance and goods work, all across the line

Duncan: Goods and passenger work, all across the line

Duke: Tourist rides, normally at the north end of the line

Mighty Mac: Goods and passenger work, normally at the northern end of the line

Freddie: Goods and passenger work, all across the line