These

These (THS) is the official currency of the Island of Sodor. One of these is equal to about £1.75.

Banknotes of the 'These' currency
Every banknote of the 'These' currency depicts the head of the National Bank of Sodor, Arthur Slugworth and a place on the Island of Sodor. Here are a list of the banknotes and the places they depict.

Terminology
Units of 'these' are defined by the term "of these", for example: "This chair costs three of these." For smaller denominations, the term 'and [amount] of those' is added on the end, for example: "This table costs 48 of these and 5 of those."