Those are the machine codes for the jucntions rather than human names, but it's the best yet!
Any idea what the "ISP" stands for/derives from?
I assumed that they referred to various
In
Spection
Points where the member of staff on-board the train may need to check the state of the line ahead before proceeding. Most are referenced in the Working Timetables (have a look at my WTT thread).
For the junction names, that list is actually incomplete so I'll have an educated guess at naming some/all of them but you may need the Carto map handy!
JC2M - Canning Town Junction 2 (Merging points to Canning Town Platform 2 from Royal Victoria Platform 2 or West Silvertown Platform 2)
JC3M - Canning Town Junction 3 (Merging points to Canning Town Platform 3 from West Silvertown Platform 2
and potentially from West Silvertown Platform 1 or Royal Victoria Platform 1)
JC4M - Canning Town Junction 4 (Merging points to Royal Victoria Platform 1 from Canning Town Platforms 3 or 4)
JCAW - Canary Wharf Junction (Merging points to Canary Wharf Platform 1/2 from Westferry Platform 1 or West India Quay Platform 2)
JCRO - Crossharbour Junction (Merging points to Crossharbour Platform 2 from Mudchute Platforms 1,2 or 3 or Crossharbour Siding)
JCTM - Canning Town Junction (Merging points to Canning Town Platform 2 from Royal Victoria Platform 2 or West Silvertown Platform 2)
JCTX - Canning Town Junction (Crossover points to Canning Town Platform 2 from Royal Victoria Platform 2 AND leading from Canning Town Platform 1 towards West Silvertown Platform 1)
JNQM - North Quay Junction (Merging points to West India Quay Platform 2 from Poplar Platform 3 or Westferry Platform 1)
JNQX - North Quay Junction (Crossover points to West India Quay Platform 2 from Westferry Platform 1 AND from West India Quay Platform 3 to Poplar Platform 2)
JRMS - Royal Mint Junction (Merging points to Shadwell Platform 1 from Bank Platform 9 or Tower Gateway Platform 1/2)
JRMX - Royal Mint Junction (Crossover points to Tower Gateway Platform 1/2 from Shadwell Platform 2 AND to Shadwell Platform 2 from Bank Platform 9)
JROM - Royal Victoria Junction (Merging points to Royal Victoria Platform 1 from Canning Town Platforms 1 and 3
and potentially from Canning Town Platforms 2 and 4 as well)
JWEM - Westferry Junction (Merging points to Westferry Platform 2 from Poplar Platform 4 or West India Quay Platforms 3 and 4)
JWEX - Westferry Junction (Crossover points to West India Quay Platform 2 from Westferry Platform 1 AND to Westferry Platform 2 from Poplar Platform 4)
JWIQ - West India Quay Junction (Merging points to West India Quay Platform 3 from Canary Wharf Platforms 3/4 and 5/6)
JWSM - West Silvertown Junction (Merging points to West Silvertown Platform 1 from Canning Town Platforms 1 and 3
and potentially from Canning Town Platform 2)
JWSX - West Silvertown Junction (Crossover points to West Silvertown Platform 1 from Canning Town Platform 3 AND to Canning Town Platform 2 from West Silvertown Platform 2)