Trains

As we travel through Montana and North Dakota we see trains day and night.  When we are biking along the road and a train comes along, we wave and and conductor blows the whistle.  But they also blow their whistle all night long.  Every night we seem to be camped close to the tracks.  Last night I counted 6 trains during the night and each time they blew their whistle loud and long.  It makes it impossible to sleep through the night.  The trains are long and seem to be caring coal and oil.