On 26 Oct, 21:49, Boltar wrote:
Where were the entrances to the old tunnels at Drayton park that used
to go to Finsbury? Are they completely buried or is there anything
still visible? Since the victoria line partially uses these does it
pass under drayton park and come back up or does it go around?

The original tunnel portals were destroyed when the GN electrification
link was put in. However, the severed end of one of the tunnels, with
iron lining segments, used to be clearly visible from trains between
Finsbury Park and Drayton Park.

There's an interesting bit about a visit to the disused tunnels at:

http://tinyurl.com/ysa7hl