Good point, not sure how I would know if I do? It doesn't mention it on RealTime Trains, is that the best place to check..?
Yes, on RTT any allowance (pathing, engineering, performance) are shown beneath the station name on the section they apply. In the extract below you can see pathing time at (amongst other places) Barking and Grays. Note that the pathing time at any specific location doesn’t mean that on the day that is exactly where you will be slowed.
Realtime Trains - FRGT 1216 Lawley Street F.L.T. to London Gateway Frghtliner
Realtime Trains is an independent source of live realtime running information for the Great British railway network.
www.realtimetrains.co.uk