Modelling Railway Track

Hello,

I have 3D linestrings representing the running edges of a railway line.

I would like to turn them into 3D rails.

BUT My linestrings have too many vertices - I would like to reduce to about a third the number of vertices.

AND extruding the rail profile along the linestrings takes for ever and makes the file unmanageable (solid by extrusion)

Can anybody help me  ?

Three things :

Reducing vertices in linestring.

Modeling rails - is extrusion the correct way to go ?

General advice about modelling railway track.

Thanks

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