Where am I supposed to pay the excess fare?

我应该在哪里补票？

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The normal single journey fare is deducted when passengers enter the system. Any excess fare paid is refunded at the return trip exit gate.

乘客于市区入闸时会被扣正常单程车费，多收的车费会于回程出闸时退回。

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Where am I supposed to pay the excess baggage fare?

我应该在哪里付逾重行李费？

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On its website, Virgin Trains warns travellers they will be charged an excess or penalty fare if they board a train without a ticket or attempt to change from standard to first class without a first class ticket.

BBC: George Osborne