Robin Chittenden / View out of train on the Ceredigion The Vale of Rheidol Railway, Wales, UK. August.

Alan Williams / Steam train leaving Berwyn station beside the River Dee and the Chainbridge Hotel on the Llangollen Heritage Railway to Corwen North Wales, UK, September 2017.

Franco Banfi / An old steam locomotive, Circum-Baikal Railway, Trans-Siberian Railway, Irkutsk Oblast, Lake Baikal, Siberia, Russia.

Graham Eaton / A steam train enters Aberglaslyn Pass, alongside the river Glaslyn, near Beddgelert, Wales, UK June

Loic Poidevin / Old rusted steam train, Sewards Peninsula, Nome, Alaska, USA, September 2015.

Loic Poidevin / Old rusted steam trains, Sewards Peninsula, Nome, Alaska, USA, September 2015.

Gary K. Smith / Steam train on the Heritage Poppy Line from Sheringham to Holt, with Weybourne Mill in background, Norfolk, UK, April.

Sandra Bartocha / Steam train going through Norway Spruce (Picea abies) forest, Harz National Park, Brocken, Germany, February 2010

Gary K. Smith / Steam train 68030 'Hunslet Austerity 3777' ex-Coal Board saddle tank, on the North Norfolk Railway, Poppy line, Norfolk, UK, September 2011

Philippe Clement / Steam engine / locomotive at the Boat of Garten railway staion, Highland, Scotland, UK, May 2010

Jerry Monkman / The cog railroad on Mount Washington in Twin Mountain, White Mountains, New Hampshire, USA. October 2007

Jerry Monkman / An old steam engine from the cog railroad on Mount Washington in Twin Mountain, White Mountains, New Hampshire, USA. October 2007