The Metro management warned that it would invoke provisions of the Essential Services Maintenance Act (ESMA) and action would be taken if anyone resorts to disrupting metro services.
The BMRCL Employees Union said though it is registered and affiliated to the Indian National Trade Union Congress, it has not yet been recognised.
The management has not accorded recognition despite the union fulfilling all the criteria, INTUC general secretary D Leelakrishnan told reporters.
Other office-bearers of the union rued that there wasdisparity in the salaries.
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"The Delhi Metro Rail, Nagpur Metro Rail and Kochi Metro Rail employees are getting more salary than us," said an office bearer requesting anonymity.
Meanwhile, the BMRCL managing director Mahendra Jainsaid the Metro service has been declared as essential services under Essential Services Maintenance Act and stringent action would be taken if anyone resorts to disrupting metro services.
Jain appealed to the employees not to get carried awayby elements who try to mislead them, disrupt operations and inconvenience people.
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