Trial runs were undertaken using the 373/2 sets on both the East and West Coast Main Lines and passenger information signs and Eurostar lounges were installed at stations along the route. As the high-speed rail line between London and the Channel Tunnel, High Speed 1, was not under construction Eurostar services within the UK were forced to use existing rail lines and connecting junctions were built to allow Regional Eurostars access via the congested North London Line. In all British Rail invested £140 million in infrastructure to allow the services to operate.