Modeling topic

which foam to use? what works best for building layouts?
Ok, just asked a few questions on hot glue guns and now have questions on which foam to use to build my layout. I plan on using the blue 1/2" 2 layers thick as a base and want to know what foam to build the rest of the layout with. I have the woodland scenics foam cutter to sculpt it but I need to know which foam to get.
Home depot sells a product called handipac which looks like it might work well and a product called PlastiSpan HD.
Has anyone used these products and will they emit toxic fumes when I cut them with the hot wire technique?
Low road clearance rail bridge. All steel trestle in urban setting?
I have a spur leading into the side of a brick structure on the first floor which leaves very little clearance for road vehicles delivering to the docks directly below it.
So far I've been messing with, I think, Atlas N scale girders to sit above tie height. I know in country New South Wales they used timber trestles through some towns.
I'm modelling around N/E US in an urban area. Does anyone know of a steel trestle? Just like the timber ones of old, but all steel in a industrial complex?

Re-building the ColdStor module - step by step
Whew! Busy holiday week! I hope everybody had a good one. I managed to climb out of my food induced coma long enough to work on rebuilding the my FreeMoN module this weekend. I took a bit of video illustrating the way I'm going about it.
The first part covers putting together the faceplates for the ends of the modules.
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