Personally I'd like to either scrap them, or cascade them as far away from EMT as physically possible
Careful what you wish for. Given no new single car trains are to be built and some EMT lines are very rural the option of making 143s and 144s accessible may be taken up to be used as replacement for 153s.
Or a more positive view- if you reform the 153s in to 155s then you could give EMT all the 155s and EMT could then release their 156s and the some of the 158s to another operator.
That'd be me, and I stand by it. A 222 can easily keep to 158 timings on the Notts - Liverpool section of the route. They would lose a bit of time east of Ely though due to the condition of the track to Lakenheath
The option of having a fast Manchester-Nottingham service (avoiding Sheffield) was being considered. So you could have a Liverpool-Manchester-Nottingham service and a Manchester-Sheffield-Nottingham-Norwich service.
Plans for changing services on the Hope Valley line seem to be a less advanced stage than plans on other lines. It does, however, look likely that a Liverpool-Sheffield service will take the place of Liverpool-Scarborough on the CLC line and also that platforms at Liverpool South Parkway will be extended to be able to take 6 car 185s despite North TPE services not expected to call there after December 2016.
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Just issue grandfather rights to all trains built before 2020 and bob's your uncle.
Or leave the flaming EU and avoid any of this madness in the first place.
Pacers, Sprinters and certain EMUs have been running on grandfather rights since 1994. The 31 December 2019 deadline was agreed because by then all pre-1990 stock should have been withdrawn or had a full mid-life refurbishment which should have then included accessibility improvements. The shelf-life of a DMU which hasn't had a major refurbishment is 25-30 years (35-40 for an EMU) so the 142s with the original bus seats should have either had a full refurbishment by now or been scrapped.
Any toilets on trains should be retention toilets from 31 December 2019 for the same reason - by then the 158s (and any older DMUs) should have had a full refurbishment or been scrapped.
31 December 2019 was what John Major's government proposed not what the EU proposed.
I'm not sure why leaving the EU would help, it's government policy in practically every country to support disabled people whether or not they're anything to do with the EU. Even Haiti's government has a "Secretary of State for the Integration of Persons with Disabilities".