Bryn Eglwys Quarry NGR SH700060 The three inclines Beudynewydd Cantrybedd and Alltwyllt were part of the Bryn Eglwys Quarry System The history of the Talyllyn Railway is inextricably tied up with the history of Bryn Eglwys slate quarry All but invisible from the main valley road and from the present day terminus of nbsp