1900

January

 * 22 January - The first electrified tram route in Southampton opens, running from Junction to Shirley.

March

 * 8 March - The Dublin & Lucan Electric Railway opens.

May

 * 29 May - Southampton Corporation Tramways open the Stag Gates - Prospect Place - Holy Rood route.

September

 * 12 September - Southampton Corporation Tramways open the Holy Rood - Bridge Street - Docks route.

October

 * 4 October - Southampton Corporation Tramways open the Stag Gates - Portswood route.

December

 * 17 December - The Board of Trade approve Nottingham Corporation Tramways Sherwood route.

Unknown date

 * The Isle of Man Tramways & Electric Power Co. Ltd., owners of the [{Douglas Bay Horse Tramway]] and the Manx Electric Railway go in liquidation.
 * The London County Council Tramways get permission from Parliament to electrify the system.
 * Electric services commence on the Nottingham Corporation Tramways.
 * An outbreak of "Pink-eye" in horses curtails the Nottingham and District Tramways Company Limited's horse tram operations.
 * The Blackpool tramway extends north to Gynn Square and links up with the Blackpool & Fleetwood Tramroad.