"Richard M Willis" wrote in message
om...
There was engineering work on the circle line a few saturdays ago. I
arrived
at Tower GW DLR and walked to Tower Hill. I was told it was closed and
I
had to walk to Aldgate instead. I did this and was surprised to find
that the
Oystercard had treated it as a valid interchange. How did it do this ?

Does this work at Euston/Euston Square? Or is it a time related thing?

--
TC