I started my layout around 1997 as a 4 x 8 layout.  I later expanded it by adding another section that's about 4 x 8 and makes the layout into an "L" shape.  Below are pictures of the layout as it evolved.  There was a lot of learning going on throughout all of the construction which I put towards my Z scale layout and other projects.

Click the images below to see how I build various areas and how to improve different elements of your layout.

Building the Main Station

Building the Extension

Building the Suburban Station

Hoboken Terminal Construction

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Building my N scale Layout