The line is leased by Metronet (now LUL) in order to test and commission the next generation of London Underground trains, known as Sub Surface Lines (SSL) trains. Serco Assurance were awarded the contract to manage the whole of the test track of behalf of Metronet (LUL) which will give them the opportunity to attract other interested parties to the line.

NR test trains continue to appear sparodically

March

Bombardier's class 172 'green' DMU is at the test track for commissioning and shakedown running

	The first class 172 Turbostar heads south past Widmerpool on a murky 10th March 2010 Neil Booton
	The first proper DMU on the line since the class 180 in 2000 Neil Booton

4Z10/11 ran on Monday 8th March but surprisingly instead of the class31 and DBSO it consisted of the TRU 950001. No photos I'm afraid.

February

4Z10/11 was supposed to run on Monday 8th but was cancelled. It is also booked to run on the following dates:- March 22nd, April 5th and April 12th.

For details and photos of test train running since Alstom left and Metronet took over see here.

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