These two are dizygotic twins. That is, non-identical.
They used to be identical. How did it happen? Here’s the potted history.
These Comeng trains were built during the 80s.
As part of privatisation, the then-two operators M>Train and Connex took half each, and refurbished them (via EDI and Alstom, respectively). Added CCTV, automated announcements and signs, put in new seats, that kind of thing.
Somewhere in this tale, you’d expect a stuff-up, right? Here it is: Nobody (eg the government) thought to ask the two companies to refurbish them in ways that kept them compatible. In case, y’know, say one company dropped-out and a single operator ended up running the whole system.
As happened in 2004.
So then they spent a bunch more money making the two halves of the Comeng fleet talk to each other again.
But internally and externally they still look a bit different, as the picture above shows.
PS. 12:30pm. I’m told we can expect more handholds to be installed on Comeng trains in the next few weeks, similar to the doorway H-bars on the test train.