P.A. Problems

P.A. Problems is the sixth episode of the twenty-first season.

Plot
The Fat Controller splashes out on a new public address system, but the engines and passengers are struggling to hear the announcements. Holidaymakers end up at the quarry, quarry workers end up at the beach and Lord Callan ends up with an unexpected delivery of pigs!

Characters

 * Thomas
 * Edward
 * Percy
 * Toby
 * Emily
 * Reg
 * Sir Topham Hatt
 * Lord Callan
 * The Knapford Stationmaster
 * The Bird Watcher
 * The Great Composer
 * The Grumpy Passenger
 * Some Workmen
 * James (cameo)
 * Diesel (cameo)
 * Sidney (cameo)
 * Philip (cameo)
 * Annie and Clarabel (cameo)
 * Henrietta (cameo)
 * The Teacher (cameo)
 * One of Dowager Hatt's Friends (cameo)
 * The Lady with the Big Hat (cameo)

Locations

 * Knapford
 * Anopha Quarry
 * Harwick
 * Callan Castle
 * Crocks Scrap Yard
 * Maithwaite (portrait)
 * Black Loch (portrait)
 * Brendam Docks (mentioned)
 * Bluff's Cove (mentioned)
 * Vicarstown (mentioned)
 * Maron (mentioned)
 * Kellsthorpe Road (mentioned)

UK

 * John Hasler as Thomas
 * Keith Wickham as Edward, the Fat Controller, Lord Callan, the Knapford Stationmaster, the Great Composer, the Grumpy Passenger and a Quarry Worker
 * Nigel Pilkington as Percy
 * Rob Rackstraw as Toby
 * Teresa Gallagher as Emily and some Passengers
 * Matt Wilkinson as the Bird Watcher and the Knapford Station Worker
 * Tim Whitnall as Reg and a Quarry Worker

US

 * Joseph May as Thomas
 * William Hope as Edward and Toby
 * Christopher Ragland as Percy
 * Jules de Jongh as Emily
 * Keith Wickham as Sir Topham Hatt, Lord Callan and the Grumpy Passenger
 * Tim Whitnall as Reg

Trivia

 * This is the five-hundredth episode of the series.
 * Going by production order, this is the seventh episode of the twenty-first season.
 * In the scrapyard, a bike, a blue car, and the bus stop sign from Samson Sent for Scrap can be seen.
 * The line "Have you tried turning it off and on again?" is a reference to the British sitcom, "The IT Crowd".

Goofs

 * Throughout the episode, all the teal 7-plank trucks appear to be glowing red on the bottom plank indicating that they were modified from the red trucks.