This article lists and details episodes from the twenty-third series show, which began airing on 2 September 2019 in the UK, and first aired on 18 May 2019 in the US. It consisted of 20 11-minute episodes as well as three 20-minute specials, two of which are directly interconnected and form a movie titled Digs and Discoveries. It was the last season to air on the Nick Jr. Channel in the US, with 2 specials aired.
Keith Wickham as Gordon (UK), Edward (UK), Henry (UK), Glynn, Den, Norman, Harold (UK), Bertie, Skarloey, Sir Topham Hatt, the Bird Watcher, the Grumpy Passenger, Passenger, the Great Railway Show Judge, a Child (US/UK), Some Children (UK), some Passengers, and some Workman
Kerry Shale as Gordon (US), Henry (US), Diesel (UK/US), Harold (US), Kevin (US), Max (US), and the Troublesome Trucks
Teresa Gallagher as Emily (UK), Annie and Clarabel, Belle, The Lady in Yellow Dress and Hat, The Teacher, Albert's Wife, The Lady in Blue Dress, Some Children, School Girl with two curly ponytails, The Ginger Haired Boy, Brenda, and The Sodor Rangers (US/UK)
Jules de Jongh as Emily (US), Some Children (US), and Caitlin (UK/US)
Rob Rackstraw as James (UK/US), Toby (UK), Stanley, Owen, the Man with Green Waistcoat and Grey Hair, The Crown Thief 2 (US/UK), a Passenger (UK/US), Monty (US), and the Troublesome Trucks
Bulgy wishes for buses to take the passengers instead of a train and gets his wish after accidentally tainting a water tower with soil. But after Thomas and the other friends get ill, Bulgy soon learns that he and Bertie need a lot more help to handle the work.
540
2
"Crowning Around"
Dianna Basso
Camille Ucan and Rose Johnson
3 September 2019 (2019-09-03)
50b
When Rajiv loses his crown, he thinks that no one, including the birds, the tigers, and the Troublesome Trucks, would no longer worship him and leaves Thomas, Ashima, and Shankar to do his jobs as well as their own. but Rajiv soon learns that he can be useful with or without his crown when he saves Shankar from a runaway Noor Jehan.
541
3
"Chucklesome Trucks"
Dianna Basso
Davey Moore
4 September 2019 (2019-09-04)
51a
Rebecca defies expectations when she works with the Troublesome Trucks to take to Vicarstown and has a very amusing day, much to Thomas, James, and Percy's surprise, as well for the Troublesome Trucks as they become surprised when Rebecca plays along with their jokes.
542
4
"The Other Big Engine"
Dianna Basso
Davey Moore
5 September 2019 (2019-09-05)
51b
Thomas meets another big blue electric engine in Brazil named Gustavo that reminds him of Gordon.
543
5
"Heart of Gold"
Dianna Basso
Michael White
6 September 2019 (2019-09-06)
52a
While Toby fills in for Stephen at Ulfstead Castle, he is insulted by Diesel and the passengers for how he looks, despite Glynn and Millie trying to cheer him up. But when two thieves steal King Godred's Crown, Toby gives chase and foils their escape plan winning the people over.
544
6
"Batucada"
Dianna Basso
Davey Moore
9 September 2019 (2019-09-09)
52b
After hearing from Gabriela and Cassia about Batucada and being invited by some musicians to the carnival, Thomas finds a way to take part in the Brazilian carnival music.
545
7
"Gordon Gets the Giggles"
Dianna Basso
Becky Overton
10 September 2019 (2019-09-10)
53a
Gordon becomes worried when he gets a serious case of the giggles after Rebecca gets covered with honey and vegetables.
546
8
"Thomas Makes a Mistake"
Dianna Basso
Camille Ucan and Rose Johnson
11 September 2019 (2019-09-11)
53b
Thomas causes confusion and delay by not seeking help from Charubala when he makes a mistake by leaving his delivery of silks at the wrong station.
547
9
"Diesel Do Right"
Dianna Basso
Davey Moore
12 September 2019 (2019-09-12)
54a
Diesel plays a trick on Rebecca to try to get Den, Dart, Norman, Sidney, and Paxton in trouble for a change.
548
10
"Grudge Match"
Dianna Basso
Davey Moore
13 September 2019 (2019-09-13)
54b
Raul wants to beat Thomas in a game as revenge for losing against him at the Great Railway Show on the Mainland, but his competitive nature soon gets him into trouble.
549
11
"Steam Team to the Rescue"
Joey So
Davey Moore
19 October 2019 (2019-10-19)
55
When the diesels are out of action as the shed doors are shut tight, the Steam Team, including Edward, Henry, Rosie, and Stanley, have to pitch in to do the diesels' work as well as their own to take passengers along and shunt the Troublesome Trucks. Soon, Thomas has the Steam Team help at the Docks to help Cranky, Carly and Big Mickey with the crate load and rescue Percy, who has been buried in crates.
550
12
"Panicky Percy"
Dianna Basso
Camille Ucan and Rose Johnson
16 December 2019 (2019-12-16)
56a
Percy starts to cause confusion and delay by panicking over nothing as he thinks Thomas had an accident from an avalanche.
551
13
"Laid Back Shane"
Dianna Basso
Camille Ucan and Rose Johnson
21 December 2019 (2019-12-21)
56b
Shane was having too much fun until he got stranded in the desert with Aurbry and Aiden.
Thomas discovers that he doesn't know as much as he thinks he does while working in Italy with Gina and meeting new friends like Ester the excavator and Mia. He also learns the intriguing tale of the legendary Lost Engine by Stefano and runs into trouble on an old, abandoned line while trying to take some cargo to the museum not knowing the way.
When Jack and the Sodor Construction crew arrive in Italy, including a new buldozer named Brenda, Thomas is jealous of their amazing discoveries and wants to impress his friends by finding an amazing discovery. Then, an accident leads Thomas to making the biggest discovery of all, a steam engine named Lorenzo and his coach named Beppe. Thomas's wish has finally been granted, although not in the way he had expected.
554
16
"Rangers on the Rails"
Dianna Basso
Davey Moore
5 May 2020 (2020-05-05)
59a
Emily takes the Sodor Rangers to the campgrounds at Callan Castle for Nia, but ended up derailed in the progress.
Brenda learns it is important to work as a team instead for caring about her own jobs as he thinks Max and Monty were dumping stone on her smooth path.
Darcy makes some mistakes on her first day, but as Alfie and Oliver fail to clear rocks to make a tunnel for the new road, she soon makes up for it when everyone sees what see can really do.
When overhearing from Thomas that Gina is to take Dame Bella Canto to a concert in Rome, Lorenzo gives Beppe to Gina to take the Orchestra while he takes a bigger coach so he can take Dame Bella Canto to the concert, but he was lost without Beppe and gets stranded in a scrapyard in the woods.
As Miss Jenny's construction crew, Jack and the Pack, work on a construction site at the Led Mines to put in a visitors' park, Max and Monty's antics get them into trouble.
Thomas wants to perform opera like Lorenzo and Beppe, but finds it a lot more difficult than he first thought. Unfortunately, his attempts hurt Ester's hearing, the cows to run away, demolish an old building, and accidentally lead to him losing his voice just as Mia tells him that he has a message to deliver to Stefano.
