No replacement buses on the Craigieburn line right now.No part of the line is suspended. Live times and any delays are on the map.
View live on LiveDelays.com Opens the live map. Free, no sign-up.A closure on the main line is a different matter. Every service on this line calls at North Melbourne - all 2129 of them - so a stretch that includes it cannot be worked around, and buses have to carry everyone.
North Melbourne is the junction. Every service calls there, and it is where a train can be switched off the branch and onto the direct route.
A cancelled service and a closed line are different things. One cancellation removes a single train and the next one still comes; a closure stops trains along a stretch and puts buses on instead.
The status above covers the second. For the first - one service cancelled, or running late - the map has every train on the line right now, with the delay on each and what riders on board are reporting.