i kinda like "what kills this", an inversion of widening the moat
BNI has a large investment, sunk cost, like a toll bridge,
pricing power for inflation
tied to economic cycle, west coast to mississippi trade, recession hurts revenue
also push back on powder river coal trade, with crash in coal price
historically, railroads went bankrupt in recessions, because they were levered for the good times
right now is the worst case, playing out
on a recovery they will boom