Class 43 MTU Renumbering
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The majority of the Class 43 HST power cars had their original Paxman Valenta engines replaced between 2005 and 2010, with MTU 16V 4000R41R engines.
East Coast operator GNER chose to renumber its HST power cars by adding 200 to the number. Arriva Cross Country did the same, so those power cars also fall within the same number series, 432XX and 433XX.
First Great Western operated power cars were fitted with MTU engines, but retained the existing numbers, as did Network Rail's three used on the New Measurement Train.
Grand Central was the last operator of Class 43s with Valenta engines, these were coverted to MTU in 2010, and the six power cars renumbered into a 434xx series.
East Midlands Trains (formerly Midland Mainline) had chosen Paxman VP185 engines to replace the Valenta in their HST fleet. Two power cars, 43072 & 43074 transferred from EMT to East Coast in May 2011, and these two later changed from VP185 to MTU engines.
The conversion from Paxman Valenta to MTU engine was carried out by Brush Traction at Loughborough. Other upgrades were also carried out at the same time.
The 'Admitted date' is when the Power car arrived at Brush Loughborough for MTU fitment, the 'Released date' is when it departed from Brush for tests and the 'In Service date' is when it entered service.
43306 was released on 12th March 2007 from Brush Loughborough and returned to Neville Hill for testing, during testing several faults were found with the power car and it returned to Loughborough for repairs it was re released on 20th April 2007.
Numbers shown in brackets did not run in service with the operator before re-engineering.
Liveries :
GR: GNER, dark blue with red stripe. GNER gold branding
GU: GNER, dark blue with red stripe, no branding.
GN: GNER, dark blue with white stripe (National Express branding).
NX: National Express livery Silver-Grey and White.
EC: East Coast light grey with cerise stripe
EM: East Midlands Trains (Stagecoach) Mid Blue with red & orange up-sweep. (East Coast branding)
MM: Midland Mainline, Ocean Blue with grey stripes.
VT: Virgin Trains (original) red and black.
XC: Cross Country Plum, silver and grey
East Coast operator GNER chose to renumber its HST power cars by adding 200 to the number. Arriva Cross Country did the same, so those power cars also fall within the same number series, 432XX and 433XX.
First Great Western operated power cars were fitted with MTU engines, but retained the existing numbers, as did Network Rail's three used on the New Measurement Train.
Grand Central was the last operator of Class 43s with Valenta engines, these were coverted to MTU in 2010, and the six power cars renumbered into a 434xx series.
East Midlands Trains (formerly Midland Mainline) had chosen Paxman VP185 engines to replace the Valenta in their HST fleet. Two power cars, 43072 & 43074 transferred from EMT to East Coast in May 2011, and these two later changed from VP185 to MTU engines.
The conversion from Paxman Valenta to MTU engine was carried out by Brush Traction at Loughborough. Other upgrades were also carried out at the same time.
The 'Admitted date' is when the Power car arrived at Brush Loughborough for MTU fitment, the 'Released date' is when it departed from Brush for tests and the 'In Service date' is when it entered service.
43306 was released on 12th March 2007 from Brush Loughborough and returned to Neville Hill for testing, during testing several faults were found with the power car and it returned to Loughborough for repairs it was re released on 20th April 2007.
Numbers shown in brackets did not run in service with the operator before re-engineering.
GNER / NXEC / East Coast Fleet
| Old No. | Old Livery | Admitted | Released | New no. | New Livery | In service |
| (43100) | (VT) | 23rd March 2006 | 1st December 2006 | 43300 | GR | 7th December 2006 |
| (43090) | (VT) | 23rd March 2006 | 15th December 2006 | 43290 | GR | 27th December 2006 |
| 43120 | GR | 23rd October 2006 | 9th January 2007 | 43320 | GR | 11th January 2007 |
| 43114 | GR | 30th November 2006 | 16th February 2007 | 43314 | GR | 21st February 2007 |
| 43106 | GR | 9th January 2007 | 12th March 2007* | 43306 | GR | 3rd May 2007 |
| 43167 | GR | 15th February 2007 | 24th April 2007 | 43367 | GR | 2nd May 2007 |
| 43118 | GR | 12th March 2007 | 15th May 2007 | 43318 | GR | 30th May 2007 |
| 43109 | GR | 24th April 2007 | 28th June 2007 | 43309 | GR | 3rd July 2007 |
| 43096 | GR | 15th May 2007 | 17th July 2007 | 43296 | GR | 21st July 2007 |
| 43038 | GR | 28th June 2007 | 29th August 2007 | 43238 | GR | 1st October 2007 |
| 43008 | GR | 17th July 2007 | 1st October 2007 | 43208 | GR | 20th October 2007 |
| 43116 | GR | 29th August 2007 | 30th October 2007 | 43316 | GU | 31st October 2007 |
| 43113 | GR | 1st October 2007 | 30th November 2007 | 43313 | GU | 6th December 2007 |
| 43006 | GR | 24th October 2007 | 9th January 2008 | 43206 | GN | 11th January 2008 |
| 43115 | GR | 30th November 2007 | 6th February 2008 | 43315 | GN | 14th February 2008 |
| 43112 | GN | 9th January 2008 | 18th March 2008 | 43312 | NX | 19th March 2008 |
| 43102 | GN | 9th January 2008 | 11th April 2008 | 43302 | NX | 12th April 2008 |
| 43117 | GN | 6th February 2008 | 17th April 2008 | 43317 | NX | 17th April 2008 |
| 43107 | GN | 10th March 2008 | 9th June 2008 | 43307 | NX | 9th June 2008 |
| 43039 | GN | 17th April 2008 | 26th June 2008 | 43239 | NX | 27th June 2008 |
| 43099 | GN | 9th April 2008 | 26th June 2008 | 43299 | NX | 27th June 2008 |
| 43105 | GN | 11th June 2008 | 13th August 2008 | 43305 | NX | 15th August 2008 |
| 43111 | GN | 26th June 2008 | 3rd September 2008 | 43311 | NX | 3rd September 2008 |
| 43077 | GN | 26th June 2008 | 14th October 2008 | 43277 | NX | 14th October 2008 |
| 43119 | GN | 28th August 2008 | 7th November 2008 | 43319 | NX | 7th November 2008 |
| 43057 | GN | 13th August 2008 | 10th December 2008 | 43257 | NX | 10th December 2008 |
| 43095 | GN | 14th October 2008 | 17th December 2008 | 43295 | NX | 17th December 2008 |
| 43108 | GN | 7th November 2008 | 12th February 2009 | 43308 | NX | 12th February 2009 |
| 43051 | GN | 4th December 2008 | 18th March 2009 | 43251 | NX | 19th March 2009 |
| 43110 | GN | 4th December 2008 | 18th March 2009 | 43310 | NX | 19th March 2009 |
| 43072 | EM | xx July 2011 | xx November 2011 | 43272 | EC | xx December 2011 |
| 43074 | MM | xx November 2011 | xx March 2012 | 43274 | EC | xx March 2012 |
Liveries :
GR: GNER, dark blue with red stripe. GNER gold branding
GU: GNER, dark blue with red stripe, no branding.
GN: GNER, dark blue with white stripe (National Express branding).
NX: National Express livery Silver-Grey and White.
EC: East Coast light grey with cerise stripe
EM: East Midlands Trains (Stagecoach) Mid Blue with red & orange up-sweep. (East Coast branding)
MM: Midland Mainline, Ocean Blue with grey stripes.
VT: Virgin Trains (original) red and black.
XC: Cross Country Plum, silver and grey
Arriva CrossCountry Fleet
| Old No. | Old Livery | Admitted | Released | New No. | New Livery | In Service |
| (43101) | (VT) | xx 2007 | 16th July 2008 | 43301 | XC | 16th July 2008 |
| (43103) | (VT) | 9th July 2007 | 30th July 2008 | 43303 | XC | 31st July 2008 |
| (43085) | (MM) | 14th November 2007 | 13th August 2008 | 43285 | XC | 15th August 2008 |
| (43121) | (VT) | 25th January 2008 | 10th September 2008 | 43321 | XC | 14th September 2008 |
| (43157) | (VT) | xx February 2008 | 26th September 2008 | 43357 | XC | 27th September 2008 |
| 43184 | MM | 16th July 2008 | 7th November 2008 | 43384 | XC | 7th November 2008 |
| 43178 | MM | 30th July 2008 | 26th November 2008 | 43378 | XC | 26th November 2008 |
| 43007 | MM | 13th August 2008 | 10th December 2008 | 43207 | XC | 10th December 2008 |
| 43104 | MM | xx September 2008 | 12th December 2008 | 43304 | XC | 12th December 2008 |
| 43166 | MM | xx September 2008 | 23rd January 2009 | 43366 | XC | 23rd January 2009 |