Some sites that may of be interest to you:

NY City Transit Modelers Group
An excellent group of guys discussing subway modeling and more.
A forum covering All railroads.

NH Custom Painting
Custom Painting

Trains are Fun

A very useful site packed with tons of info and pics.

Great Decals
A site relating to decals with many links.

NYC Model Transit Association
This site relates to modeling NYC subways.

Elevated structure

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