Ownership of Northern Height lines

Some of the trackbed on the open air has become public footpaths. One part near Muswell Hill has housing across it.

The section nearest to Edgware station still has track and is used to transfer materials from road to rail.

Bridges were Allocated Numbers at least on the Northern City line from Drayton Park to High Barnet, and used code 'HB', the Bridge 'HB20' is at Woodside Avenue, but if all Bridges are counted backwards towards Drayton Park HB1 would be a Overbridge north of Drayton Park, if including flyunders at Finsbury Park and its Subways, it appears no numbers or plates are visible.

Bridges on the Mill Hill - Edgware Branch were allocated 'E', and started after Finchley Central on first bridge on the Mill Hill Branch as E1 Nether Street/Dollis Park, E16 would have been Deans Lane at the end of the Edgware Depot Spur, however the line would have continued north from Edgware on the alignment of the Burnt Oak line, so possibly Bridges north of Edgware may have been allocated 'NT' numbers rather than 'E' ones

The other part of the Line from Morden - Golders Green to Edgware were Coded NT and 'NT1' is Morden Depot Footbridge, and 'NT37' is Station Road in Edgware

Alexandra Palace Branch would have likely to be allocated Bridge Numbers and 4 Bridges were in place but not aware of the Numbering other than would start at 1 maybe AB would have been used

Note: The Middle Numbers are the Km distance from Ongar, Which changed to the Northern City line from the Victoria Line at Highbury & Islington (36.29), and carried on until East Finchley  the Mill Hill Line took Distances from Kings Cross Loop
 


n/a Muswell Hill Overbridge Muswell Hill - Alexandra Palace Northern City Line (AB4)
n/a Viaduct Viaduct Cranley Gardens - Muswell Hill Northern City Line (AB3)
n/a St James's Lane Underbridge Cranley Gardens - Muswell Hill Northern City Line (AB2)
n/a Muswell Hill Road Overbridge Highgate - Cranley Gardens Northern City Line (AB1)


HB20 Woodside Avenue Overbridge 46.03 Highgate Depot - East Finchley Northern Line
HB19 Station Subway Subway 42.48 Highgate Northern City Line
HB18 Shepherds Hill Overbridge Crouch End - Highgate Northern City Line
HB17 Northwood Road Underbridge Crouch End - Highgate Northern City Line
HB16 Stanhope Road Underbridge Crouch End - Highgate Northern City Line
HB15 Crouch End Hill Overbridge 41.01 Crouch End Northern City Line
HB14 Crouch Hill Overbridge Stroud Geen - Crouch End Northern City Line
HB13 Mount View Road Underbridge Stroud Geen - Crouch End Northern City Line
HB12 Mount Pleasant Villas Underbridge Stroud Geen - Crouch End Northern City Line
HB11 Stapleton Hall Road Underbridge Stroud Geen - Crouch End Northern City Line
HB10 Upper Tollington Park Underbridge 40.09 Stoud Green Northern City Line
HB9 Oxford Road Footpath Underbridge Finsbury Park - Stroud Green Northern City Line
HB8 Stroud Green Road Underbridge Finsbury Park - Stroud Green Northern City Line
HB7 Station Subway Subway 38.91 Finsbury Park Northern City Line
HB6 Station Subway Subway 38.90 Finsbury Park Northern City Line
HB5 Seven Sisters Road Underbridge Drayton Park - Finsbury Park Northern City Line
HB4 East Coast Main Line Overbridge Drayton Park - Finsbury Park Northern City Line
HB3 Flyunder Overbridge Drayton Park - Finsbury Park Northern City Line
HB2 Flyunder Overbridge Drayton Park - Finsbury Park Northern City Line
HB1 Drayton Park Overbridge 37.66 Drayton Park Northern City Line

E1 Nether Street / Dollis Park Footbridge 50.01 Finchley Central - Mill Hill East Northern Line
E2 Crescent Road Overbridge 50.16 Finchley Central - Mill Hill East Northern Line
E3 Viaduct Viaduct 50.48 Finchley Central - Mill Hill East Northern Line
E3A Dollis Road Viaduct 50.47 Finchley Central - Mill Hill East Northern Line
E3C Dollis Brook Viaduct 50.49 Finchley Central - Mill Hill East Northern Line
E4 Frith Lane Underbridge 50.97 Finchley Central - Mill Hill East Northern Line
E5 Bittacy Hill Underbridge 51.07 Finchley Central - Mill Hill East Northern Line
E6 Signal Gantry Gantry Mill Hill East Northern Line
E7 Sanders Lane Overbridge Mill Hill East - Mill Hill The Hale Northern Line
E8 Purdey Road Overbridge Mill Hill East - Mill Hill The Hale Northern Line
E9 Page Street Overbridge Mill Hill East - Mill Hill The Hale Northern Line
E10 Footpath Subway Mill Hill East - Mill Hill The Hale Northern Line
E11 Watford Way Overbridge Mill Hill East - Mill Hill The Hale Northern Line
E11 Bunn's Lane Overbridge Mill Hill East - Mill Hill The Hale Northern Line
E12 Railway Bridge (MML) Overbridge Mill Hill The Hale - Edgware Northern Line
E13 Bunn's Lane (North) Overbridge Mill Hill The Hale - Edgware Northern Line
E14 Edgware Brook Overbridge Mill Hill The Hale - Edgware Northern Line
E15 Culvert Structure Mill Hill The Hale - Edgware Northern Line
E16 Deans Lane Overbridge Mill Hill The Hale - Edgware Northern Line
Edgware Station via Mill Hill would be 56.06km

The Official Distance for Bushey Heath would have been 60.92 taking the  via Mill Hill distance.

The section north of Edgware was to be 'new build', so most likely it would have had full LPTB ownership.

There are probably a few scenarios here.

The line was transferred to LPTB - probably not
The line remained LNER until 1948 when it was due to be transferred to LPTB.
The line remained LNER until 1948 when it became British railways.

I suspect the latter but the answer if not available may lie in what happened with other lines such as the Central Line extensions or the District Line to Upminster?

I do not know about the Central line east to Epping, etc, but I thought that the Upminster route was part of BR until 1969. Thats why some of the stations had (and in a few cases still have) British Railways Eastern Region signage. Nowadays the surviving BR signage is for 'heritage' reasons.

Barking and Upminster are still Network Rail stations, with C2C signage.