Bylaws deter uncivil , disruptive and dangerous acts , such as smoking , the consumption of food and drink , the frivolous use of safety features , and trespassing on the railway tracks . Penalties ranging from fines to imprisonment are imposed for these offences . Under the Rapid Transit Systems Act , acts such as smoking , the consumption of food and drink within stations and trains , the misuse of emergency equipment and trespassing on the railway tracks are illegal , with penalties ranging from fines to imprisonment .