The Glasgow, Barrhead and Kilmarnock Joint Railway was a railway jointly owned by the Caledonian Railway and the Glasgow and South Western Railway, completed in 1873, and giving the latter a shorter access to its Carlisle main line. A branch to Beith was also built. It was formed by extending the earlier independent Glasgow, Barrhead and Neilston Direct Railway, which is also described here; that line was taken over by the joint company.