Who models cutaways?
The most common cutaways are of a trackside industry along the
edge of the fascia that’s been cut away to expose the inside. This is a really cool technique if you love to super detail
interiors.
An alternate approach is to cut away part of a building such as a roundhouse or engine shed to expose the innards.
One cutaway technique I haven’t seen is that of splicing an entire train in half lengthwise to expose the freight
or passenger details and even the engine’s engine. You could try this with a problem engine. This would be really cool but
would require some engine blueprints.
I’m surprised that subway guys haven’t cut a tube in half lengthwise to show a subway tunnel.
About the only cutaway that’s really common is where the track ends at the edge of the fascia, it is cut, to indicate that it
extends. Same with a cutaway river or lake; some have even added fish and bottom plants in the cutaway view.
If you don’t like cutaways and think they are cheesy, you could instead make it more
prototypical by designing a building that is under construction so that the cutaway looks natural.
For a steam engine or even a diesel, you could put one in the shop with the chassis off. It wouldn’t be a true cutaway but
would show some of the guts.
Besides the subway dudes, if you have a tunnel, you could do a cutaway of that along the edge of the layout; perhaps add
a plexiglass window pane over it.
I’ve considered instead of using fascia, actually modeling the underlying strata: top soil, perhaps with a gopher tunnel,
then layers of rock, maybe an aquifer, possibly some underground pipes. I’m really amazed that no one has yet done this as
it would really be cool.
As you can see, the cutaway technique has many applications that could add some interest to your layout.