Edited sentence: A railway running the length of the route would provide a useful alternive in event of problems on the ECML(East Coast mainline).Firstly, buses are percived by the genral public as being dirty, slow, noisy and uncomfortable.Guided busway schemes in other areas-most notably in Birmingham and edinburugh- have failed misireably, while rail schemes and tramways have succeeded.Secondly, the bus will be forced to drive through the already sevearly congested roads of central cambridge, causing a dramatic increase in journey times.There are a number of problems with this idea