There are engineering works planned at Hitchin this weekend that will call for an isolation of the overhead supply past the worksite. East Coast class 91's will be passing through the isolated section with their pantograph down. Here is a short movie of last time this method was used..     In addition all up trains will not call at Hitchin and will pass through, bang road, up direction on the down fast. Trains will set back from the up fast at Biggleswade onto the down fast and run bang r