Well if those who now have 195s dislike them that much, we'll happily do a swap here in the North East and they can have our clapped out 156s instead, they'll soon be wanting the 195s back!
The 195’s and 331’s were built on the cheap and rushed into service before faults were addressed.
There was a reason CAF had an empty order book when the other train builders didn’t…
CAF were not the only ones with an empty order book at the time - Bombardier had not yet receieved any Aventra orders other than the TFL units, and did offer the Aventra for Northern's new units. The primary reason CAF were selected instead of Bombardier was their ability to build a common design of DMU and EMU, whereas Bombardier were only offering an EMU.
What will happen to the 195s 196s etc. if HM gov goes for electrification.
They'll likely still have work somewhere in the UK as DMUs up until they're life expired around the 2045-2050 mark. In the event that they weren't of any use as DMUs, it is possible to convert them to EMUs but it would be extensive work given that they have mechanical transmission, which would need replacing if they were to be converted to EMUs.
A trick was missed by not building them with electric transmission, as that would have made the conversion to EMU near enough as simple as adding a pantograph and transformer.
Northern Ireland Railways have an all-CAF fleet for their internal services and they have gone back for more so must be happy with them; a few years since I rode on one but I don't remember any issues with the ride, suggesting that Northern's were built down to a price.
The 4000 series (but not the 3000 series) DMUs in Northern Ireland have the same engines as the 195s but that's where the similarities between the two end. The NIR units have outside framed bogies rather than the inside framed bogies used on the GB units, and are based on the 332 and 333 designs rather than the Civity design which the GB units are all based on.