Shamus,
Never out of boredom ! I have left a project for over five years, but that was a case of I didn't like the way it was turning out, and needed the inspiration to make it right.
The railroad sometimes has to wait its turn while I devote time to other projects. Right now, I am rebuilding the schooner Phantom, and scratch building a parallel project, a schooner in 1/32 scale.
I got some sub roadbed cut for the three new modules, did some research on an outside frame 3' gauge 2-6-6-2 that is in progress,
have ongoing research into the materials, and construction technique for HO scale willow trees.
There's an SD90MAC project waiting to start, an SD40T3 (Bessimer) in progress, an Arbour models Allegheny that needs all new frames to go with the correct size drivers( this will be fully equalized), and a drive mechanism for the MDC two truck Shay.
Then there is the ongoing detailing of the three modules I've posted photos of, and shows to take them to.
When work on a project becomes too repetitive, I have other projects with different "skill requirements" to keep things interesting and enjoyable.
I love building models, and model railroading provides the variety that keeps life "spicey". Oh,, and the Lake County Model railroad Club, where I am a member, has started a project replacing almost a third of the layout. I'll have to set aside some time for that too !
Pete