Actually, many many many years back (i think its in 1995), there
are money changing machines in Yishun Int. The machine was as big
as a avm at mrt stations. However, no idea what happened to the
machines, proberbally someone found the usage too low and decided
to remove it?
Actually, many many years before 1995, there were coin changing
machines at every bus interchange. They were introduced in the mid
80s when all the bus services become One-Man-Operated and paying
the exact fare was required. The machines were red and
they were about the size of a vending machine. You put your note at
the top and KA-CHING!, the loose coins will fall into a metal bowl
below. Initially it accepted $1 or $5 notes. Later, $2 notes were
also accepted and a slot was also added for $1 coins. With the
introduction of the magnetic farecard in the 1990s, most people
don't need to change coins anymore and the machines fade away.