If there are bodyshell issues then experiences with the class 397 and 331 EMUs (also from the Civity family) are presumably also relevant. Anything to be learnt from those fleets?
At the start of the franchise the 175s were due to leave (ie. go off lease) on 31/05/2022, that's only around 55 days away. The 158s were due to leave 31/10/2022.
The 197 is a upgrade from a 195 and different spec / software than the 196, the emus are different beasts. Each fleet is an upgrade from the last with different specifications, so they have there own issues as a result of this.
The 197s have the latest generation MTU powerpacks and DPFs, so Euro 5 or 6 emissions software.
They have great potential compared with tfws existing units, such as faster / more economical / better emissions/ better customer experience etc
Regarding the 175s the lease has been extended as there's no way there will be enough 197s to cover services by September, there's just too much testing / training. So tfw change there plans and timescales because of this.
We will see the 158s for a while longer than planned aswell, there will be a number retained for the cambrian as introducing the ertms 197s will be a complicated process. 197003 has the ertms system isolated and can be seen on the crewe to Salop training runs.