As more of the lines are block the more stain is put on the other lines to cope with the passenger load as they try use other lines to travel and so more and more trains break down. The tube network is slowly blocked.
The solution is not to stop cars entering roads, but to stop people entering underground stations therefore the treatment for relapsing-remitting and progressive MS must be dramatically different. Likewise we want to repair the broken tunnels (remyelinate), which will allow the trains to operate again.
Trials aimed at blocking these pathways have begun.. More in the Pipeline!