I notice that, as of a couple of days ago, this call, which used to return a list of all valid routes, is no longer valid.
I’ve worked round this by using /Line/Meta/Modes to get the list of modes and then using the isScheduledService flag to build a list for /Line/Mode/{modes}/Route.
Is there anywhere where such changes are announced before they are implemented, so that developers have time to make suitable amendments?