Fantasy: You can create your own Multiple Unit/Multiple Unit Family.

[Energy]

and the same CIS system as used on the Class 700s.

PIS! CIS is at stations. The manufacturer for the 700s, 707s and 717s PIS is Televic Rail, who also supplied the PIS for quite a few other British trains.

 

[tetudo boy]

• Train class/family name: Desiro City Next Generation
• Replacing: Class 465/466
• Number Built: 90
• Number of carriages: Fixed 10 Formations
• Capacity: 550 Seats / 640 Standing
• Operator(s) : SouthEastern
• Train Length: 203.4m
• Car length: 20.2m
• Width: 2.80m
• Height: 1.10 m
• Door Formation: Same as existing Desiro City Class
• Maximum Speed: 100mph
• Traction System: 25 kV 50 Hz AC Catenary / 750 V DC Third rail (5,500 hp)
• Multiple Working: Within Class and Class 700/707/717 for rescue purposes
• Extras: First Class, Onboard Wifi, Twin Power Sockets per every two seats, toilets including a accessible toilet, fold down tables on the back of the airline seating and the same CIS system as used on the Class 700s.
• May have tables per groups of 4 seats in Standard if TOC takes up option.

WAIT! Wasn't there an existing thread talking about the possibility of additional Desiro City's being ordered for SouthEastern!?

 

[D365]

WAIT! Wasn't there an existing thread talking about the possibility of additional Desiro City's being ordered for SouthEastern!?

That's my thread, and it's speculative. At the moment, Southeastern are not known to have any orders for brand new stock.

 

[tetudo boy]

That's my thread, and it's speculative. At the moment, Southeastern are not known to have any orders for brand new stock.

I think I had a mix-up of words...

 

[Aictos]

That's my thread, and it's speculative. At the moment, Southeastern are not known to have any orders for brand new stock.

Indeed, all I did was take the best parts from all three of the Desiro City Class and used it to create what I think would be a decent unit fit for both Metro and Outer Suburban work - note the Class that I used doesn't actually exist so I've complied with the guidelines provided by the OP of this thread especially as they said nothing about not using existing designs to provide a brand new one.