No, they won't solve perturbed running. If something is running late, you are going to sit in a loop until the next train passes.
The problem with all single track lines with passing places. Though in days gone by the passing places were a lot more frequent. Sutton Bridge Jnc to Cruckmeole Jnc (Minsterley Branch) was double track, Yockleton and Westbury were loops, Buttington Jnc to Forden double track, loops at Mongomery and Abermule, double track from Newtown to Moat Lane Jnc, loops at Caersws, Carno, Talerddig, Llanbrynmiar, Cemmaes Rd, Machcynlleth, Dovey Jnc, Glandyfi, Ynyslas, Borth, LLandre and Bow St and a bit of double from Llanbadarn Fawr into Aberstwyth.
We have pointed out that theirs still no scope for recovery since NR opted for what's been put in ground. Caersws is the obvious spot as something held at Talerddig can at least come forward.
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Perhaps it's time to invent double-tracked routes instead of single line?
Can you imagine the equivalent road through mid Wales being one vehicle wide with passing places? :roll:
There's a bit of the old Mid Wales Railway trackbed south of Erwood that's a single track road with passing places. You even use the railway bridges. You can get a good lick on but have to keep your wits about you for stuff coming the other way. You get back on the A470 over a chain bridge across the River Wye.