A huge fire has ripped through major railway arches sparking huge delays for commuters this morning. A number of gas cylinders are also believed to have exploded during the early stages of the fire under the London Underground Piccadilly line tracks in South Harrow, fire crews said. London Fire Brigade dashed to reports of a fire affecting a range of railway arches and businesses, including vehicle workshops, situated within the arches near Roxeth Green Avenue in South Harrow at around 1.30am.