5 Dollars Mass Rapid Transit

Issued to commemorate the opening of Singapore's MRT network, which had begun phased operations in 1987 after years of fierce political debate over whether the city-state could justify the infrastructure cost. The decision to proceed came directly from Lee Kuan Yew's cabinet, overriding early feasibility studies that had favored an all-bus system.

The Monetary Authority struck this as a circulation commemorative — legal tender at face value, though few spent one on a fare.