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points by giovannibajo1 16 hours ago | 0 comments

Would that work in tunnels and forests too?

Tunnels are controlled by a single block - only one train can ever be allowed access at once, period. Until the "current" occupant train is verifiably out of the tunnel, that block is forbidden to all.

Forests are irrelevant; rail right-of-way contains no trees, and is wide enough to assure clear "view" of satellites.

[–] 1718627440 7 hours ago

You are just answering how the current system actually works. This discussion was about how a hypothetical system works based on GPS or radar alone.

[–] lxgr 4 hours ago

> Tunnels are controlled by a single block - only one train can ever be allowed access at once, period.

Absolute nonsense. Do you have any idea how long some tunnels are?

[–] 1718627440 4 hours ago

There are actually different definitions for what a block is. It can be both a section where you can decide for trains to enter or where you can change their sequence (Zugfolgeabschnitt vs. Zugmeldeabschnitt, don't know the English terms) Also it can be a physical implementation of any constraint between components of different stations.

But yes there does not need to be a limitation on there only being a single train in a tunnel.