How many sizes of tube train are there? Central line trains always feel
tiny compared to, say, circles; and it makes sense that a deep tunnel
might be smaller than a cut-and-cover; is that so? Are
northern/Victoria/Piccadilly any bigger or smaller? How come metropolitan
trains feel so much bigger than circles (as big as real trains), when they
use the same track? Are they bigger, or is it just the decor? Is it
because the northern half of the circle has bigger tunnels? Does that mean
one could run real trains through them? Is there any way to get a train
from, say, the Anglia or Great Eastern lines near Liverpool St down into
the circle? Does the Thameslink tunnel stop at Moorgate? Does that mean we
could turn the West Anglia into a Retropolitan (tm) line which connected
northeast London with the northern half of the circle? Or take the the met
out to Chingford? And what's so light about the DLR? It's standard gauge,
after all. Could you in fact take one train and drive it willy-nilly over
the entire network? If so, where can i buy second-hand trains? And
finally, is it obvious i spend far too much time in the bloody tube and
have now lost my mind?

Thanks,
tom

PS Sorry this has no relevance to oyster

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This should be on ox.boring, shouldn't it?