The origins of the Mass Rapid Transit (MRT) are derived from a forecast by city planners in 1967 which stated the need for a rail-based urban transport system by 1992.he lines are built by the Land Transport Authority, a statutory board of the Government of Singapore, which allocates operating concessions to the profit-based corporations, SMRT Corporation and SBS Transit. These operators also run bus and taxi services, thus facilitating full integration of public transport services.
A silent heart attack is a heart attack that happens without causing noticeable symptomsâor at least, without causing symptoms so severe that the victim cannot ignore them. Most of us tend to think about a myocardial infarction (heart attack) as a pretty dramatic eventâand most of the time, it is.
Atherosclerosis is often called the silent killer, as the first sign for many is a fatal heart attack or stroke. Atherosclerosis doesnât cause any symptoms until narrowing of an artery reaches 70 percent or becomes completely blocked. In blockage of heart arteries, symptoms can include: 1  Chest pain (angina). 2  Shortness of breath. 3  Indigestion. 4  Arrhythmias. 5  Numbness, tingling, pain, and infections in extremities.