As the blurb says its discretionary, I’ve caught the train from my local stop to hebden bridge and mytholmroyd (northern rail) a few times recently, the guards have been pretty good, even friendly and asking me about the riding,
But not Having an issue with the muddy state of my bike
Bottom line is its discretionary over 2 bikes, if it’s a busy train then they may enforce the 2 bike rule, if this is the case with a busy platform split up, and look like you are seperate travellers. I’m not sure they would object to a couple and a single bike. Cross your fingers you don’t get an anal guard
some of the trains have specific bike racks storage other trains just have bigger spaces for storage, look for the green bike logos above the doors, as the conductors/guards will advice which doors /carriages to enter the train
From memory I saw a couple of kids with BMXs and then a child/parent carrying bikes and they all got on, smaller bikes mind