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Sorry but that is not the Junction Inn seen in the show, the Inn you are looking for has been renamed as the Tunnel End Inn, which in Waters Road, Marsden. I suspect the original name was a reference to the canal nearby.
Or could possibly have been the railway as trains could diverge through either set of tunnels so it was technically a junction. Such practice of naming any possible switch from one set of tracks to another as a junction was more prevalent on the old Midland Railway and the linet Marsden was originally built in 1849 by LNWR.
The pub is right on a road junction; Ainsley Lane, Reddisher Road, Waters Road and a very short unnamed road. If not the road, more likely the railway than the canal, as I believe the nearest canal junction is with the Huddersfield Broad at the Aspley Basin in Huddersfield at the eastern end of the Narrow. The next nearest one is at the western end, at Ashton-Under-Lyne. But the railway line is about 0.1 mi. down the hill from the pub. No idea exactly where its two-tunnel option occurred, though.
The railway tunnels start just after Marsden Station, there are actually three I recall - a twin bore pair and a double track one (the newest one which is still in use) which with the canal tunnel makes four in all - collectively known as Standedge Tunnels.
I'm not at all familiar with the rail tracks between Marsden Station and the canal tunnel entrance as they're not obvious either from the towpath or from the train to Manchester. Just in case there's anything to see, I'll try to remember to pay better attention next time I walk the towpath or ride that route.
On the walk down to Waters road, the track and tunnels are visible, there was a scene in the Seymour years when they stood and watched the train pass on that spot
Can I thank all people who have replied ,it has added another site to visit in the summer
The maps with the locations are excellent but would it be possible to have another section with the location of all sites in a numbered list with the location pointers on the map numbered to match the list?
On the walk down to Waters road, the track and tunnels are visible, there was a scene in the Seymour years when they stood and watched the train pass on that spot