''Morganth'' an intermodal based DCC layout

[upnick]

Hi Guys,

I would like some advice for an overpass to service the intermodal section off the layout from hopefully the mine road board,

Where would you put it and how long should it be /how many lanes wide ?



Heres the plan with the inside of the tracks already there i have 12inches wide to play with for the tracks for the intermodal scene on both boards two mi jack cranes built up for handling the red circle is one idea i had the overpass would go to the right hand side to meet the backboard into a rockface tunnel passing over the upper railroad tracks there.

Also what are the real dimensions of round supports of an overpass in diameter as i have seen a type to model from plastic tubing.

I would like to depict an access/exit road for the trucks to haul the containers from the yard but need some ideas of dimensions and input please such as here else the road would fit in well ?