After the initial trouble it didn’t end up being too hard, save for the very final goal (balance over 50k). It was just that the start of the scenario throws a bunch of new challenges all at once - much higher engine costs, lots of npc track and stations blocking your way, awkward preplaced lines, fewer of each resource available. That in turn means your early moves store up trouble for later that need to be reworked at some point at great expense.