Two numbers came out of the rail settlement. MTR pays HK$2.25 billion to the government over high-speed rail delays. Separately, the government settles its rail disputes with MTR, with HK$5.05 billion in costs at stake.

Subtract one from the other and HK$2.80 billion is left over. The reports do not say whether that is what the government gave up, what stayed with MTR, or a figure that never belonged in the same sum (which is the usual fate of a number that sits next to a bigger number in a headline).

The counterparties matter more than the arithmetic. The government is MTR's majority shareholder. It was the claimant on the delay bill and it is also the largest owner of the party that paid it. When MTR's minority holders read a HK$2.25 billion payment, part of what they are pricing is a cheque that goes mostly to a shareholder who already owns most of the company.

So the settlement closes a dispute between a landlord-owner and its operator, and the public reporting gives the payment and the exposure but not the split. Look at what the filing would have to carry for a listed company: a payment of this size by an HKEX-listed issuer to its controlling shareholder is the kind of item the Main Board Listing Rules' Chapter 14A connected transaction regime exists to illuminate. I have not seen MTR's filing and the news block does not say which chapter, if any, it was made under.

My read is that the HK$2.25 billion is the settled number and the HK$5.05 billion is the size of the argument it ended. The difference between them is the part of this story still without an explanation.