<Table> <Tr> <Th_colspan="2"> Thomas & Friends </Th> </Tr> <Tr> <Td_colspan="2"> Thomas the Tank Engine </Td> </Tr> <Tr> <Th> Also known as </Th> <Td> Thomas the Tank Engine & Friends (original title) Thomas & Friends: Big World! Big Adventures! (season 22) </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Television series </Td> </Tr> <Tr> <Th> Created by </Th> <Td> Britt Allcroft </Td> </Tr> <Tr> <Th> Based on </Th> <Td> The Railway Series by Rev. W. Awdry Christopher Awdry </Td> </Tr> <Tr> <Th> Written by </Th> <Td> <Ul> <Li> Rev. W. Awdry (1984--95) </Li> <Li> Christopher Awdry (1986--95) </Li> <Li> Britt Allcroft (1984--98) </Li> <Li> David Mitton (1984--2002) </Li> <Li> Various (2002--present) </Li> <Li> Sharon Miller (2008--12; head writer) </Li> <Li> Andrew Brenner (1991--92, 1998, 2013--present; head writer) </Li> </Ul> </Td> </Tr> <Tr> <Th> Directed by </Th> <Td> <Ul> <Li> David Mitton (1984--2003) </Li> <Li> Steve Asquith (2002, 2004--08) </Li> <Li> Greg Tiernan (2008--12) </Li> <Li> David Baas (2013--14) </Li> <Li> David Stoten (2014--present) </Li> <Li> Rob Silvestri (feature length specials 2013--14) </Li> <Li> Don Spencer (2014--15) </Li> <Li> Dianna Basso (2015--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Voices of </Th> <Td> See List of Thomas & Friends voice actors </Td> </Tr> <Tr> <Th> Narrated by </Th> <Td> <Ul> <Li> Ringo Starr UK: (1984--90) </Li> <Li> Michael Angelis UK: (1991--2012) </Li> <Li> George Carlin US: (1984--95) </Li> <Li> Alec Baldwin US: (1998--2002) </Li> <Li> Michael Brandon US: (2003--12) </Li> <Li> Pierce Brosnan UK / US: (2008; The Great Discovery) </Li> <Li> Mark Moraghan UK / US: (2013--17) </Li> <Li> John Hasler UK: (2018--present) </Li> <Li> Joseph May US: (2018--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Composer (s) </Th> <Td> <Ul> <Li> Mike O'Donnell </Li> <Li> Junior Campbell </Li> <Li> (1984--2003) </Li> <Li> Robert Hartshorne (2004--16) </Li> <Li> Ed Welch (2004--08) </Li> <Li> Peter Hartshorne (2011--16) </Li> <Li> Chris Renshaw (2016--present) </Li> <Li> Oliver Davis (2016--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United Kingdom </Td> </Tr> <Tr> <Th> Original language (s) </Th> <Td> English </Td> </Tr> <Tr> <Th> No. of series </Th> <Td> 21 </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 512 (list of episodes) </Td> </Tr> <Tr> <Th_colspan="2"> Production </Th> </Tr> <Tr> <Th> Executive producer (s) </Th> <Td> <Ul> <Li> Britt Allcroft (1984--86, 2002) </Li> <Li> Angus Wright (1991--98) </Li> <Li> Peter Urie (2002--03) </Li> <Li> Jocelyn Stevenson (2003--06) </Li> <Li> Christopher Skala (2007--11) </Li> <Li> Marion Edwards (2009--15) </Li> <Li> Lenora Hume (2009--10) </Li> <Li> Karen Barnes (2011--13) </Li> <Li> Kallan Kagan (2013--17) </Li> <Li> Jeff Young (2013--15) </Li> <Li> Steven Hecht (2013--15) </Li> <Li> Michael Carrington (2013--14) </Li> <Li> Christopher Keenan (2014--present) </Li> <Li> Edward Catchpole (2015) </Li> <Li> Marianne Culbert (2016) </Li> <Li> Kyle MacDougall (2016--present) </Li> <Li> Jamie LeClaire (2016--present) </Li> <Li> Phil LaFrance (2016--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> <Ul> <Li> David Mitton (1984--98) </Li> <Li> Robert D. Cardona (1984--86) </Li> <Li> Britt Allcroft (1991--98) </Li> <Li> Phil Fehrle (2002--03) </Li> <Li> Simon Spencer (2004--08) </Li> <Li> Nicole Stinn (2008--12) </Li> <Li> Ian McCue (2011--17) </Li> <Li> Halim Jabbour (2013) </Li> <Li> Robert Anderson (2013; 2015--2017) </Li> <Li> Brian Lynch (2013--15) </Li> <Li> Jennifer Hill (2014--15) </Li> <Li> Lynda Craigmyle (2016) </Li> <Li> Jane Sobol (2016) </Li> <Li> Tracy Blagdon (2016--present) </Li> <Li> Micaela Winter (2016--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Location (s) </Th> <Td> <Ul> <Li> Clapham Junction (1984) </Li> <Li> Clearwater Studios Battersea (1984) </Li> <Li> Shepperton Studios (1986--2008) (2018 - present) </Li> <Li> Nitrogen Studios (2008--12) </Li> <Li> Arc Productions / Jam Filled Toronto (2013--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Editor (s) </Th> <Td> <Ul> <Li> Michael Dixon (1984) </Li> <Li> Rebecca de Burgh Mound (1986) </Li> <Li> John Wright (1991--2002) </Li> <Li> Kate Buckland (2004--08) </Li> <Li> Kevin Pavlovic (2009--12) </Li> <Li> Adam Garner (2013--2015) </Li> <Li> Gavin Ebedes (2014--present) </Li> <Li> Craig Barnikis (2015--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Running time </Th> <Td> 4 - 5 minutes (1984--2003); 7 minutes (2004--08); 11 minutes (17 min.; one episode) (2004--2017); 22 minutes (2018 - present) </Td> </Tr> <Tr> <Th> Production company (s) </Th> <Td> <Ul> <Li> Clearwater Features (1984--86) </Li> <Li> The Britt Allcroft Company (1984--2000) </Li> <Li> Gullane Entertainment (2000--2002) </Li> <Li> HiT Entertainment (2003--present; Mattel) </Li> <Li> Mattel Creations (2017--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Distributor </Th> <Td> Various distributors </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> <Ul> <Li> Channel 5 (UK; 2005--present) </Li> <Li> Spacetoon (Arab world; 2016--present) </Li> <Li> PBS Kids (US; 1989--1997, 2004--2017) </Li> <Li> WETA Kids (US; 2005 - 2017) </Li> <Li> Sprout (US; 2005 - 2015) </Li> <Li> Nick Jr . (US; 2018 - present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Picture format </Th> <Td> <Ul> <Li> 4: 3 480i (NTSC) 576i (PAL) (SDTV) (filmed) (Series 1--5) </Li> <Li> 16: 9 480i (NTSC) 576i (PAL) (SDTV) (filmed) (Series 6--10) </Li> <Li> 16: 9 1080i (HDTV) (filmed) (Series 11) </Li> <Li> 16: 9 1080p (HDTV) (CGI) (Series 12--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Audio format </Th> <Td> <Ul> <Li> Stereo (1984--95) </Li> <Li> Dolby Surround (1998--2002) </Li> <Li> Dolby Digital 5.1 (2003--present) </Li> </Ul> </Td> </Tr> <Tr> <Th> Original release </Th> <Td> 9 October 1984 (1984 - 10 - 09)--present (present) </Td> </Tr> <Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Website </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Thomas & Friends </Th> </Tr>

How many thomas the tank engine episodes are there
find me the text answering this question