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Sliding doors are one of the design problems that featured in the LEGO: Tangara (2023) MOC.

There are a few forces at play here:

1. A brake is in place to stop the doors accidentally opening due to inertia when the train rounds a corner. Push the brake open by tilting the lever on the roof.
2. Both doors are held in place attached to a sliding axle. Hold the door rail and pull outwards.
3. Each doors slides individually across the axle. Hold each door rail and slide them to the side.

I went through a few iterations on the doors, finally happy with these ones. A good amount of rigidity (they don't fall apart when played with) and stability (they don't open by themselves when the train moves).

This article is part of the LEGO: Tangara (2023) set. Feedback? Questions? Let's discuss on Mastodon, or email me