Ian;
As far as I have seen in where I am in Canada the LED signals are only on new crossings (usually part of street widening's) or as part of a government supported safety upgrades to existing crossings
It is not inexpensive to upgrade to LED either, I was looking at Transport Canada's web site before posting here, and they are giving a grant for an average of $5000 per crossing as their share (80%) of Canadian Government supported safety upgrades to LED heads.
At that price I don't think the Canadian or US railways can afford on their own to change all the controlled crossings to more energy efficient heads for many years.
