I think the point is that the Cambrian Line was a test bed - a bit like a sandbox where they were able to experiment and fix issues. They were able to experience situations which would have constituted a major incident on a main line, but which can be regarded as 'growing pains' under the protection of the safety system they had in place. Equipment could be assessed and modified.
There were plenty of problems to iron out. According to Wonkpedia..
Quote:
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Originally Posted by Wiki
An initial assessment by the operating company was not favourable: problems with the design and installation of the in-cab displays were identified and infrastructure failures included the control system becoming "confused" by common train movements, such as changes of speed or shunting into the depot
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However on the ECML route they are using off-the-shelf train and lineside equipment in a turnkey installation. Everything needs to be working from the first day of operations.The NCL is a busy (although arguably tidal) commuter line which serves the business centre of London.
Presumably if the digital side goes lairy they can stop all movements and revert to lineside signalling, but it may cause significant disruption to services. If enough trains stack up it will tail back to Finsbury Park on the Up Side, and this will impact ECML services. So this could be quite embarassing if it goes significantly wrong.
As always we wait with baited breath....
John