"The London Underground better known as the tube varies an impressive number of residents and tourists across the city. It opened its first line in eighteen. Sixty three as the metropolitan railway which provided locomotive trains. That carried nine point five million passengers in eighteen ninety. The line began running electric cars making it the first subway or metro system in the world world. But it's also impressively hot due to those very old deep clay tunnels containing few ventilation shafts. which lock in excess heat from the metric trisystem and make many a Londoner sweat on their daily commute? The hottest stations without air conditioning routinely get to eighty six degrees Fahrenheit. That's thirty degrees Celsius or more and rising temperatures due to global warming. Don't help but one enterprising collaboration. Between the London borough of is Lincoln and Ramble a consulting company that that works on many issues including energy and urban design will harness some of that excess subway heat for the benefit of Londoners with completion date for the project as early as late two thousand"