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Tag Archives: South West Trains

SWT Convert their Class 455 fleet to AC traction

21 Thursday May 2015

Posted by Paul Bigland in Class 455, Engineering, Rail Investment, South West Trains

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Class 455, Engineering, Rail Investment, South West Trains

Yesterday I visited South West Trains Wimbledon Park depot to see the second of their Class 455 fleet being converted to AC traction & hear Christian Roth, Engineering Director for South West Trains, who was on hand to talk about the reasons for the programme.

Converting the 91 strong fleet from DC to AC traction will cost £38m. It’s funded jointly by owners Porterbrook and the Department of Transport (with DfT stumping up a 3rd of the cost). The project has a number of aims & advantages, which are;

AC traction motors give the train regenerative braking capability saving £2m a year in electricity bills and lessening wear and tear on the braking equipment compared to pure friction braking.

They’ll have new Wheel Slip Protection (WSP) system which is based on modern, European Algorithms rather than the legacy BR system the 30yr old units have now. This will reduce wheel flats during the leaf fall season & help extend the exam period from 10,000 miles to 15,000 miles. The new A/c motors are also less prone to damage from snow ingress.

Christian explained that the cost of overhauling a Class 455 is around £150,000-£200,000, so extending that period by 1/3 on a 91 strong fleet is a not insignificant saving. It’s not hard to see that there are advantages to carrying out the conversion. But the most significant one isn’t to do with the 455s at all…

Extending the maintenance regime frees up space at Wimbledon Park allowing it to become home to SWTs next fleet – The 30×5 car Class 707 Desiro City trains from Siemens. This £210m investment is vital to tackle growth & overcrowding on the SW network. Without the space at Wimbledon Park a new depot would have been necessary, significantly altering the finances of the Class 707 project. After Christian’s briefing we went to inspect the second unit to be converted (5870) which was sitting inside the Inspection shed on 12 road. Here’s a look at the work.

Fitting the AC traction package to 62778 from 5870

Fitting the AC traction package to 62778 from 5870

AC traction motors installed in  62778s bogies

AC traction motors installed in 62778s bogies

AC traction control pack for  62778

AC traction control pack for 62778

High speed circuit breaker for  62778

High speed circuit breaker for 62778

The first unit to be converted (5732) was also done at Wimbledon Park (in exactly the same place) back in 2014. Here it is;

DG184054. First AC Class 455 conversion.  Wimbledon Park depot. 30.6.14.

Right now 5732 is undergoing tests between Bournemouth & Weymouth. Once 5870 is completed (which is expected to be 19th June) it’ll also be sent to Bournemouth & the two trains will carry out further tests such as passing at speed & running as 8-cars.

Christian told us that the testing programme is going well with the equipment performing “better than expected”
Once testing is finished by the end of July the converted trains will enter service & free up others for the programme which will be carried out at the Arriva train depot at Eastleigh, starting at the end of August/ beginning of September. Three trains per week will be converted until the programme is complete in August 2016.
So, if you’re an aficianado of the 1930s designed English Electric EE507 traction motors, you’ve got little more than a year to hear these long serving beasts in action under the 455s…

Here’s another fan with the EE507s taken out of 5870;

Roger Ford & old friends...

Roger Ford & old friends…

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