Quoting Dave Nelson <muskoka@...>:
Tim Gilbert has offered other information about restrictions by U.S.
This is largely borne out by our experience in Vermont over the years
as well. Lots of Canadian Pacific cars coming down the Connecticut River
line loaded for points in southern New England, N.Y. and N.J. and lost of
Canadian National cars for the same points coming down the Central Vermont.
The vast majority of these cars were then seen returning home empty. A CPR
or CNR car going north on these routes loaded was a rare occurrence.