Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of surviving Avro Vulcans
Table title:
Surviving aircraft
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Serial </th><th colspan=1 rowspan=1 > Geographic location </th><th colspan=1 rowspan=1 > Institutional location </th><th colspan=1 rowspan=1 > History </th><th colspan=1 rowspan=1 > Photo </th></tr>
<tr> <td colspan=1 rowspan=1 > XH558 </td><td colspan=1 rowspan=1 > Doncaster, South Yorkshire </td><td colspan=1 rowspan=1 > Robin Hood Airport </td><td colspan=1 rowspan=1 > The last airworthy Vulcan (XH558) was restored to flying condition by the Vulcan to the Sky Trust. The first post-restoration flight, which lasted 34 minutes, took place on 18 October 2007. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XJ823 </td><td colspan=1 rowspan=1 > Irthington, Cumbria </td><td colspan=1 rowspan=1 > Solway Aviation Museum </td><td colspan=1 rowspan=1 > The 22nd B.2, later converted for the MMR role. Completed 20 April 1961, delivered to 27 Squadron a day later. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XJ824 </td><td colspan=1 rowspan=1 > Duxford, Cambridgeshire </td><td colspan=1 rowspan=1 > Imperial War Museum Duxford </td><td colspan=1 rowspan=1 > Completed 11 May 1961, delivered to 27 Squadron five days later. Latterly with 101 Squadron. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XL318 </td><td colspan=1 rowspan=1 > Colindale, London </td><td colspan=1 rowspan=1 > Royal Air Force Museum London </td><td colspan=1 rowspan=1 > The first B.2 delivered to 617 Squadron, The Dam Busters, based at RAF Scampton, on 1 September 1961. Performed its last flight (and last of the 617 as a Vulcan unit) on 11 December 1981, filmed for Yorkshire Television's 617-The Last Days of a Vulcan Squadron. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XL319 </td><td colspan=1 rowspan=1 > Sunderland, Tyne and Wear </td><td colspan=1 rowspan=1 > North East Aircraft Museum </td><td colspan=1 rowspan=1 > The second B.2 delivered to 617 Squadron based at RAF Scampton, on 20 October 1961. Delivered from RAF Waddington to Sunderland Airport (the former RAF Usworth) on 21 January 1983, the largest aircraft ever to land on the site, performing a small display. </td><td colspan=1 rowspan=1 > Avro Vulcan B.2 XL319, NELSAM, 27 June 2015 (02).JPG </td></tr>
<tr> <td colspan=1 rowspan=1 > XL360 </td><td colspan=1 rowspan=1 > Baginton, Warwickshire </td><td colspan=1 rowspan=1 > Midland Air Museum </td><td colspan=1 rowspan=1 > Completed 28 February 1962, delivered to 617 squadron on 2 March. Latterly with 101 Squadron. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XL361 </td><td colspan=1 rowspan=1 > Goose Bay, Newfoundland and Labrador, Canada </td><td colspan=1 rowspan=1 > CFB Goose Bay </td><td colspan=1 rowspan=1 > Completed 14 March 1962, being delivered to 617 Squadron the next day. Latterly with 9 Squadron, due to a fire in the fuselage during a trans-Atlantic flight from Woodford to Offutt AFB in Nebraska, XL361 had to make an emergency landing at CFB Goose Bay on 13 November 1981, site of an RAF Unit and used regularly as a Vulcan exercise base. </td><td colspan=1 rowspan=1 > AvroVulcanGooseBay.JPG </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > XL426 </td><td colspan=1 rowspan=1 > Southend-on-Sea, Essex </td><td colspan=1 rowspan=1 > Southend Airport </td><td class="highlighted"  colspan=1 rowspan=1 > XL426 (G-VJET) is preserved in taxiable condition at Southend Airport, England. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM573 </td><td colspan=1 rowspan=1 > Ashland, Nebraska, United States </td><td colspan=1 rowspan=1 > Strategic Air and Space Museum </td><td colspan=1 rowspan=1 > The 101st Vulcan produced, delivered in March 1963. Gifted by the RAF to the museum adjacent to Offutt Air Force Base, Bellevue, Nebraska, in 1982 as a token of the links between the RAF and the US Strategic Air Command, based at Offutt. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM575 </td><td colspan=1 rowspan=1 > Castle Donington, Leicestershire </td><td colspan=1 rowspan=1 > East Midlands Aeropark </td><td colspan=1 rowspan=1 > Delivered to 617 squadron in May 1963. Took part in the Falklands War victory flypast over London on 28 October 1982. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM594 </td><td colspan=1 rowspan=1 > Newark-on-Trent, Nottinghamshire </td><td colspan=1 rowspan=1 > Newark Air Museum </td><td colspan=1 rowspan=1 > The penultimate Vulcan built, completed on 9 July 1973 and delivered to 27 Squadron ten days later. A 1982 permission for a Vulcan to be sold to the volunteer run NAM was initially delayed by the Falklands War, and then refused because their runway at the former RAF Winthorpe, now Winthorpe Showground, was deemed unsafe to land a Vulcan. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM597 </td><td colspan=1 rowspan=1 > East Fortune, East Lothian </td><td colspan=1 rowspan=1 > National Museum of Flight </td><td colspan=1 rowspan=1 > Completed on 26 August 1963, it was delivered to 12 Squadron the next day. The only other surviving Vulcan to have engaged the enemy in the Black Buck missions, setting the record for longest bombing raid in Black Buck 5, and causing an international incident when it had to divert to Brazil in Black Buck 6, both feats commemorated with two mission markings and a Brazilian flag painted on the nose. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM598 </td><td colspan=1 rowspan=1 > Cosford, Shropshire </td><td colspan=1 rowspan=1 > Royal Air Force Museum Cosford </td><td colspan=1 rowspan=1 > Completed on 30 August 1963, it was delivered to 12 Squadron at RAF Coningsby on 4 September. Was the originally designated bombing aircraft for Black Buck 1, but which had to turn back minutes into the flight. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM603 </td><td colspan=1 rowspan=1 > Woodford, Greater Manchester </td><td colspan=1 rowspan=1 > Woodford Aerodrome </td><td colspan=1 rowspan=1 > Completed 29 November 1963, it was delivered to 9 Squadron on 4 December. Latterly with 44 Squadron, it was the test-bed aircraft for the K2 tanker conversions. </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > XM605 </td><td colspan=1 rowspan=1 > Atwater, California, United States </td><td colspan=1 rowspan=1 > Castle Air Museum </td><td colspan=1 rowspan=1 > Completed on 17 December 1963, it was delivered to 9 Squadron on the 30th. Latterly with 50 Squadron. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM606 </td><td colspan=1 rowspan=1 > Bossier City, Louisiana, United States </td><td colspan=1 rowspan=1 > Barksdale Global Power Museum </td><td colspan=1 rowspan=1 > Completed on 18 December 1963, it was delivered to 12 Squadron on the 30th. Latterly with 9 Squadron. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > XM607 </td><td colspan=1 rowspan=1 > Waddington, Lincolnshire </td><td colspan=1 rowspan=1 > RAF Waddington </td><td colspan=1 rowspan=1 > Completed on 30 December 1963, it was delivered to 35 Squadron on New Year's Day 1964. XM607 was the bombing aircraft in Operation Black Buck, raids one, two and seven. </td><td colspan=1 rowspan=1 > XM607 SIDE VIEW.JPG </td></tr>
<tr> <td colspan=1 rowspan=1 > XM612 </td><td colspan=1 rowspan=1 > Horsham St Faith, Norfolk </td><td colspan=1 rowspan=1 > City of Norwich Aviation Museum </td><td colspan=1 rowspan=1 > Completed on 28 February 1964 by A.V. Roe Co. </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > XM655 </td><td colspan=1 rowspan=1 > Wellesbourne, Warwickshire </td><td colspan=1 rowspan=1 > Wellesbourne Mountford Airfield </td><td class="highlighted"  colspan=1 rowspan=1 > XM655 (G-VULC) was the antepenultimate Vulcan to be built, and is the youngest surviving example, preserved in taxiable condition at Wellesbourne Mountford Airfield by the 655 Maintenance & Preservation Society. </td><td colspan=1 rowspan=1 > - </td></tr>
</table>
Question:
How many surviving Avro Vulcans aircraft are still kept in taxiable condition?
Answer:
XL426 and XM655 are the surviving Vulcans, were kept in taxiable condition.