In winter, third rails were difficult to keep clear of ice, although when conditions were severe the trolley wire could also ice, and it would have to be mechanically scraped off a third rail or off a trolley wire.
Ice would have to be mechanically scraped off either a third rail or trolley wire. In winter, third rails were difficult to keep clear of ice, although when conditions were severe, the trolley wire could also ice.
In winter, third rails were difficult to keep clear of ice, although when conditions were severe, the trolley wire could also ice. Ice would have to be mechanically scraped off either a third rail or trolley wire.
In winter, third rails were difficult to keep clear of ice, although when conditions were severe, the trolley wire could also ice. Ice would have to be mechanically scraped off either a third rail or trolley wire.