Part of the Pollution, partial answer!

Many thanks to The Tyre Collection

UK Tram: A Case for Investment

Hydrogen 1 - Aruba Tram

Hydrogen Tourist Vehicles

Hydrogen 2 - Additional Hydrogen Trams for Doha

These cars carry 100 passengers per car and can be platooned up to 3 cars.

Hydrogen 3 - TIG/m self-powered electric tram

Hydrogen Tram 4

The TIG/m trial in Santa Cruz has been completed successfully

Trams & Bicycles, How it’s Done

Trams Hertfordshire A414 Corridor Strategy option

Surface Crossover (Kletterwich)- Oostende - Belgium

A low cost operational method which will enable a tramway to be built without major moving of utilities at the time of construction. Utilities can then be accessed when needed construction A simple (Kletterwich) cross over can be manufactured in a workshop locally. Used for the replacement of a major sewer in the main thoroughfare in Oostende. Service to the tram passengers was maintained With suitably signage and diversion this method can be used in the UK