Timeline:

1873: Glyn Valley Tramway opens

1886-90: Glyn Valley Tramway converts to steam operation.

1935: Glyn Valley Tramway closes.

1974: Glyn Valley Tramway Group forms.

1979: GVT Group establishes historical photograph and artefact display room in local hotel. 

1989: GVT Group acquires Pontfadog Waiting Room for preservation.

2003: GVT Group forms and registers new limited company - Glyn Valley Tramway Company Ltd.

2003: GVT Company Ltd acquires former GVT Coal Wharf in Glyn Ceiriog.

2009: GVT Group forms and registers new charitable limited company - The New Glyn Valley Tramway & Industrial Heritage Trust.

2010: GVT Group dissolves after transfering its assets and goodwill to new Heritage Trust.

2010: Heritage Trust leases former GVT Engine Shed and station yard in Glyn Ceiriog for use as museum visitor centre.

2014-16: Heritage Trust restores former GVT Engine Shed and station yard.

2017: Heritage Trust opens Glyn Valley Tramway & Industrial Heritage Museum.

2020: Heritage Trust acquires freehold of GVT Engine Shed and station yard in Glyn Ceiriog.

2023-25: Heritage Trust installs demonstration rail track in station yard.