Just found the below article on the delayed entry into service:
http://www.railmagazine.com/news/fleet/d...il-aventra
Elizabeth Line
Elizabeth Line
Elizabeth Line
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by 8222
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01 Jun 2017, 5:01 pm
RE: Elizabeth Line
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by 8222
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25 Jun 2017, 7:38 am
RE: Elizabeth Line
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by EvernishJon
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07 Jul 2017, 11:44 am