What Claude said when I asked:
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Your instinct is right that it’s an infrastructure problem, but the missing piece isn’t on the line — it’s at Coventry station.
The line itself isn’t the bottleneck. Coventry–Nuneaton is double track for its whole 10-mile length, with loops and two platforms at each intermediate station. It could physically absorb more trains tomorrow.
The blocker is terminating capacity at Coventry. Coventry sits on a two-track stretch of the West Coast Main Line carrying Avanti, London Northwestern and CrossCountry. A local train that arrives, sits, and reverses occupies a through platform for several minutes each time — and every one of those minutes is a path denied to a 125mph service behind it. The fix has always been a new bay platform (a dead-end stub set back from the main line so the Nuneaton service can wait without disrupting Euston–Birmingham traffic). That’s been the designated enabler for 2tph since 2011.
It keeps getting descoped on cost. NUCKLE Phase 1 was split into two packages: Package 1 delivered Coventry Arena and Bermuda Park stations; Package 2 — the second train per hour, the bay platform, and the signalling and track work — was deferred. Only one tender came in for the signalling, at three times the expected cost. It was hit again around 2020 by a “significant increase” in costs, prompting Network Rail to look for a cheaper approach. It’s now bundled into the Midlands Rail Hub / Coventry–Leicester–Nottingham scheme, with the bay platform still listed as the thing that unlocks half-hourly, and construction running 2025–2033.
Your passing-place hunch does apply — just at the other end of the route. The train is now a through Nuneaton–Coventry–Leamington service, and the Coventry–Leamington section is single track (Kenilworth has one platform). Single track supports one train per hour each way; doubling the Nuneaton leg means either a dynamic loop down there or splitting the through service — which puts you straight back into needing somewhere at Coventry to turn trains round.
The foundational point worth taking away: railway capacity is almost never limited by plain track. It’s limited by junctions, terminating platforms, and heterogeneity — mixing a 2-car stopper with 125mph expresses on the same pair of rails burns far more capacity than either alone, because the fast train needs a growing gap ahead of the slow one.
Where I might be wrong: I couldn’t confirm whether any cheaper alternative to the bay platform has been approved since 2025, or whether the Coventry station masterplan quietly delivered part of it. It’s also possible timetabling constraints at the Nuneaton end (freight to the Murco oil terminal, and the flat conflict with the Trent Valley lines) are a bigger factor than the public documents suggest — those tend to get buried because “we need a platform” is an easier story to sell than “the pathing doesn’t work.”
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