<P> The largest employers in the world include companies, militaries, and governments . </P> <P> Public companies and institutions are included in this list: </P> <Table> <Tr> <Th> </Th> <Th_colspan="2"> Employees </Th> <Th> </Th> </Tr> <Tr> <Th> Employer </Th> <Th> 2015 </Th> <Th> </Th> <Th> Headquarters </Th> </Tr> <Tr> <Td> United States Department of Defense </Td> <Td_colspan="2"> 2.86 million </Td> <Td> United States </Td> </Tr> <Tr> <Td> People's Liberation Army </Td> <Td_colspan="2"> 2.52 million </Td> <Td> China </Td> </Tr> <Tr> <Td> Walmart </Td> <Td_colspan="2"> 2.3 million </Td> <Td> United States </Td> </Tr> <Tr> <Td> McDonald's </Td> <Td> 1.9 million </Td> <Td> 1.7 million </Td> <Td> United States </Td> </Tr> <Tr> <Td> National Health Service </Td> <Td> 1.7 million </Td> <Td> 1.4 million </Td> <Td> United Kingdom </Td> </Tr> <Tr> <Td> China National Petroleum Corporation </Td> <Td> 1.5 million </Td> <Td> 1.7 million </Td> <Td> China </Td> </Tr> <Tr> <Td> State Grid Corporation of China </Td> <Td> 1.5 million </Td> <Td> 1.6 million </Td> <Td> China </Td> </Tr> <Tr> <Td> Indian Railways </Td> <Td> 1.4 million </Td> <Td> 1.3 million </Td> <Td> India </Td> </Tr> <Tr> <Td> Indian Armed Forces </Td> <Td_colspan="2"> 1.3 million </Td> <Td> India </Td> </Tr> <Tr> <Td> Hon Hai Precision Industry (Foxconn) </Td> <Td> 1.2 million </Td> <Td> 0.8 million </Td> <Td> Taiwan </Td> </Tr> </Table> <Tr> <Th> </Th> <Th_colspan="2"> Employees </Th> <Th> </Th> </Tr>

Which country has the most number of workers in railway department