score:5
From that sustrans page, zooming in on the map, we see that the Princes Risborough end of the mustard line is at the junction of Church St, Duke St, and High St. Looking carefully at that junction on Street View and zooming in, we can see a Cycle Route sign indicating that Thame is 7.5 miles away on Route 57, matching the information on the sustrans page near enough.
At the Thame end, we are looking for access from Windmill Road. The signage is even worse here, but there is a small Route 57 sign visible.
As for
Furthermore it seems to be high street and other roads. I was hoping to use it for some running.
The name Phoenix Trail seems to sometimes include the 2.5 miles from Princes Riseborough to the traffic-free section, and sometimes not. In the ride description leaflet:
Distance: 5 miles traffic-free
Terrain: Level route on disused railway
Getting there: 2 miles signed on road from Princes Risborough to Horsenden
But on the main page
The Phoenix Trail is flat, well-surfaced and ideal for wheelchairs and pushchairs. There is also seating every 500 metres. The first 2.5 miles out of Thame are surfaced with tarmac and the remainder with compacted limestone dust.
The 5 mile traffic-free section looks like where you want to be running.
Upvote:4
Your best bet for understanding the route is probably OpenStreetMap, which shows the path. You can see it at the Thame end and Princes Risborough end, or zoomed out for the whole thing.
At the Princes Risborough end, the Phoenix Trail proper starts a little outside of the town. There's a signposted route along Horsenden Lane from by the station, then there's a path across some fields out to the old railway line. You pass some parking, climb up on the path to the old railway, and then you're on the trail proper.
The trail itself is flat, fairly wide (2 cycling abreast is fine), and level. Every so often it crosses a road, mostly straight but one dog-leg, which you'd have to slow down for if cycling, maybe not if running.
As you approach Thame, you have a few possible finish points. When you go under Thame Park Road, there's a signposted way up to the road. When it crosses Arnold Way, you can turn right and head to town that way. Otherwise, you can follow the trail to the very end, where it finishes by the Thame Leisure Centre up on the hill to the west of the town. However, that last bit is on a narrower path than the main trail is, and you've quite a climb...
Plenty of nice pubs at the Thame end in / around the town centre, quite close to the trail, while at the Princes Risborough end I think it's a bit further to the centre to find nice pubs.
Upvote:5
There are a couple of places to join the pheonix trail from in Thame the local gym at lord williams upper school (- they can also direct you to the path that leads to the pheonix trail) is probably the best place as there is parking and a place to grab a drink and pop to the loo . This PDF should give you a start http://www.bucksmtb.co.uk/PDFs/bmtb_pdf_routeguide_phoenixtrail.pdf
As for pubs the six bells and The Thatch both have nice areas to sit outside if it's sunny. The James Figg has an open fire and does the best burgers and the birdcage is good for people watching .
Have fun