"James Farrar" wrote in message
newspsl9je2b0wnvjb9@whisk...

Actually, the two-car units (456s) always had high seat backs. The
four-car units (455s) didn't till now.


When I say "high back", I mean "above my head"; I'd never seen those
anywhere until the new units started coming in at the tail end of last
year.

They're not actually new - they're the old 455 units refurbished. If they
were cars they'd very soon qualify for a free tax disc.

Peter