Took bus in front of union station. Need to validate at desk inside front of station but did not know. Driver accepted pass and validation at end of line where switched bus quickly to do initial stops. Bus does not take you to Arlington cemetery. You have to make own way there where there is another smaller hop on hop off tram tour. Also excellent. There’s a stop close by but would have to walk a while and over busy bridge so not safe. Could stop there and cab or Lyft/uber