District Line query
 

[Crosspost added]

In article , Charles Ellson
writes
Perhaps time for a "fill in the blanks" session to see if the theory
falls down anywhere.

I dug out my WTT collection. Note that most of these are some years old.

Circle & Hammersmith: 2xx
District: 001-171
ELL: 171-175
Met: 4xx

Jubilee (pre-JLE): 3xx
Northern: 001-170
Central: 001-172
Piccadilly: 250-373

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Clive D.W. Feather | Home:
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