On approaching Euston station on a virgin a few years back I remember seeing a 'hole' in the ground with a tube line or something running under it like a tunnel with an opening in the roof to let in light. It was like a big diamond shaped hole with railings around it. Just wondered what this line is that runs though it?
This may be the line from Camden Road through (now closed) Primrose Hill. It's a bit off-topic, although we can cheekily squeeze it in here because the remains of Primrose Hill station can be seen from the top of Camden bank.
It's a rather complicated junction, and I would hesitate to try to describe it here. Suffice to say that one can go westbound from Camden Road to both the down main local and down DC lines, and eastbound from the up main local and up DC lines to Camden Road. I once travelled on an eastbound DC diversionary service, Willesden Junction to Camden Road and beyond; I think that the junction from the Euston DC line is actually underground.
I believe that there was also amidst this an empty-stock line that went off the up main local on the north side of the cutting, down under everything (including the canal) and emerged on the other side a long way towards Euston.
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I'm not sure if this has been raised before, but from the North London Line one can see North Acton on the Central Line. It might be possible also to see Chiswick Park on the District Line to Acton Town; it's certainly visible from the District Line coming up from Gunnersbury.
I don't know if this counts, but it used to be possible to see the closed Hammersmith and Chiswick station looking down from the District Line near Stamford Brook. This was a semi-circular line from South Acton on the NLL to somewhere between Hammersmith and Chiswick; nobody seems to know why it was built. It was still used for the occasional freight into the 1960s.
Newhaven Marine whilst travelling from Newhaven Harbour to/from Bishopstone.
