the first public tram through the subway ran on 24 february 1906. it ran from the angel, islington to aldwych. the chairman of the highways committee held an opening ceremony. the first journey took 10 minutes to go to aldwych and 12 minutes to get back. this was also allowing for the horse-drawn vehicles that were using the roads on the overground part of the route. on the 16 november of the same year, the routes were extended north from the angel to highbury station. the route used special trams built from materials that could not catch fire. wooden trams, like those used on other routes, were not allowed to go through the subway.