A few questions around cutting Girvan-Stranraer and replacing it with an "express coach":
- Assuming the GLC-Ayr services extend to Girvan, what'd serve Troon-Kilmarnock?
- What guarantees are there of the bus service being retained long term? It wouldn't have the level of permanence and political support that a railway does.
- What frequencies would you run such a bus service at? Who'd run it - a coach operator on a contract, or a local bus operator? Quality and long-term viability would heavily vary based on what you pick.
- How do you ensure both reliable, predictable services to Stranraer and good ferry connections at Cairnryan (to Stena, but also possibly P&O)? If you can't do both, how'd you prevent excessive duplication of services?
- How would you guarantee rail-bus connections at Girvan or Ayr? Reliability is one risk (particularly with A77 traffic), but also I doubt Girvan's small bus-only loop with a little shelter would fit a coach, and even if it did, it wouldn't be a particularly comfortable/convenient transfer compared to a direct train.
- How would you serve Barrhill? I'd suggest a Girvan-Newton Stewart coach service (departing alongside a Stranraer coach) but this is another route where managing capacity, frequency and long-term viability would be difficult, and subsidising a tendered coach route would be a risk regarding quality and reliability.
All these would have to be addressed properly for bus replacement to work. There's no cheap option other than abandoning Stranraer altogether and waiting for it to depopulate, a good bus on an obscure route still requires subsidy. Ignoring any of these issues runs the risk of replacing a decent train service with a crappy bus service, which is something we should leave in the last century.