Richard M Willis ) gurgled happily,
sounding much like they were saying :

Ummm, lemme guess... No buffets on tube trains?

Pullman cars Mayflower and Galatea ran on the Met between 1910 and
1939.

Not quite tube trains in any sense.

The Met is certainly a tube line.

It is not. It is entirely surface (or subsurface in some places), but
never tube. That line is run entirely by A stock, which is surface
stock, and would not fit in tube tunnels.

Even if you consider the Metropolitan to include the Circle,H+C,ELL,
it still isn't tube.

sigh
Tube in the sense of "London Underground", rather than tube in the sense of
the actual engineering behind the line itself.