Anybody know what "Emma's forty-niner" is (TomWaits nighthawks at the diner)?

Answer 1

It's a diner.
'nighthawks at the diner
of Emma's 49er, there's a rendezvous
of strangers around the coffee urn tonight
all the gypsy hacks, the insomniacs
now the paper's been read
now the waitress said....'