(12 Mar 2015, 9:06 pm)Coppercap40 wrote 4001/2 are not being refurbished , they were the prototypes and for quite a while after the rest of the fleet were in service they were restricted to working with each other, even now the door opening buttons are different to the rest.
I think that two of the production units are also to remain unrefurbished
This is correct, due to worse than anticipated corrison issues, the metrocar refurbishment budget went up therefore the 2 prototypes and 2 other units are not planned to get refurbished as originally planned.
the future for the unrefurbished units does remain rather sketchy.