Good Day! :D

With one of the major prerequisites of the privatisation of British Rail during the mid-1990s being the provision of updated rolling stock, thus ensuring increased passenger numbers through reliability, comfort, safety and efficiency, the Alstom Coradia units would be the first post-privatisation models to see widespread adoption across the network, coming in the guise of both diesel and electric multiple units.

However, as a result of poor build quality at the Washwood Heath factory in Birmingham, each of the individual units, including the Class 175, Class 180, Class 334, Class 458 and Class 460, would demonstrate severe faults and problems either unique to their respective class or shared across the range, smearing their reputation early, and leading to years of remediation work as these nearly new trains faced premature withdrawal.

Chapters:

0:00 - Preamble
0:53 - The Need for a New Fleet
2:33 - The Class 175
4:24 - The Class 458
6:27 - The Class 460
7:35 - The Class 334
8:17 - The Class 180
9:07 - Class 175 Problems
9:58 - Class 334 Problems
11:23 - Class 458 Problems
13:13 - Class 460 Problems
13:43 - Class 180 Problems
14:49 - Class 458 Remediation
16:53 - Class 460 Remediation
18:12 - Class 334 Remediation
18:42 - Class 175 Remediation
20:16 - Class 180 Remediation
21:50 - The Root Cause and Ruin
23:10 - Conclusion

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References:
- Key Model World (and their respective sources)
- RailUK Forums (and their respective sources)
- Wikipedia (and its respective references)