I would suspect railroad traffic sequenced along a track.  During the night=
 when other traffic is quiet you may see the railroad from farther distance=
..  In my location the noise builds and then decays over several minutes.  I=
 don=E2=80=99t see one every hour but there is a daily schedule that shows =
up and when the wind is right I hear the whistle to verify. =20
=20
    Hi Randy,

    From this I assume that you still have steam trains with very heavy eng=
ines, in the US? We are mostly electrified with motors in each carriage, bu=
t there are some local Diesel trains. We don't often see train signals, unl=
ess we are very close to a line.

    Regards,

    Chris



















I would suspect railroad traffic sequenced alon=
g a track.  During the night when other traffic is quiet you may see t=
he railroad from farther distance.  In my location the noise builds an=
d then decays over several minutes.  I don=E2=80=99t see one every hou=
r but there is a daily schedule that shows up and when the wind is right I =
hear the whistle to verify.  


 


    Hi Randy,


 


    From this I assume that you still h=
ave steam trains with very heavy engines, in the US? We are mostly electrif=
ied with motors in each carriage, but there are some local Diesel trains. W=
e don't often see train signals, unless we are very close to a line.=



 


    Regards,


 


    Chris