Freight train paths between Toton T.M.D. and West Hampstead Thameslink

[dmncf]

Why every day are there a few pairs of freight train paths between Toton T.M.D. and West Hampstead Thameslink?
I understand that unused freight train paths are not uncommon, but why Toton T.M.D. to West Hampstead Thameslink?
Examples today: https://www.realtimetrains.co.uk/se...2-28/0000-2359?stp=WVS&show=freight&order=wtt

 

[matt]

It is the path for the railhead treatment train that runs during the autumn

 

[38Cto15E]

Are any freights regularly using the Harlington up loop?

 

[swt_passenger]

It is the path for the railhead treatment train that runs during the autumn

For the whole timetable period, until May, to be more accurate. As is usual, the paths generally exist all year round and are usefully there for any NR purpose, eg autumn treatment, de-icing, or even weed killing.

 

[dmncf]

Thanks. I was hoping that this part of Hampstead had become an outstation of Toton T.M.D., with long lines of locos arriving for heavy maintenance, diesel engines revving at all hours of the day and night. Local residents will be disappointed!

 

[Bald Rick]

Are any freights regularly using the Harlington up loop?

Sundon loop, yes.