Basically, you can't without a bit of further digging.
Make that a
lot of further digging!
My full time job is to check every freight train each week to keep track
of which trains run and which don't, and even after doing so for the past
18 years without a break, I still find it hugely challenging, especially when
it comes to coal/stone trains... :-x
Freightmaster seems to have a good handle on what actually runs versus what doesn't.
You have just summed up perfectly the answer to the common question
of "why should I pay to subscribe to Freightmaster Online these days when
opentimes lists freight paths and is free of charge??"
Basically, there is a world of difference between the accuracy and
usefulness of 'raw data' and timetables which are created and updated
by hand, and luckily for me, I have over 1,000 customers who agree!
Regarding the issue of Freightmaster only featuring the most
popular 100 locations, I am also happy to provide 'bespoke' tables
for people who subscribe, so if the OP of this topic was to sign up,
I could do him a one off timetable for Tiverton Parkway, and he
could then refer to the Taunton table to keep it up to date.
I hope this clarifies the situation, but I would be pleased to
answer any further questions by PM...
MARK