<Table> <Tr> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> <Td> </Td> <Td> <Table> <Tr> <Td> </Td> <Td> </Td> </Tr> </Table> </Td> <Td> </Td> <Td_colspan="2"> West Ham </Td> </Tr> <Table> <Tr> <Td> </Td> <Td> </Td> </Tr> </Table>

What is the point of the hammersmith and city line