It seems like the map view train copy paste uses some other shortcut way than machine copy paste, could this be aligned to also allow dragging mouse to set multiple stations?

Afaik the rails IRL ale constructed using 3 types of curves:

• Euler Spiral (Clothoid) - transition curve, to linearize centrifugal force change

• Circular - the actual arc, at constant centrifugal force

• Linear - to cover distance...