Annetts key
Established Member
On the question of two Intermediate Block signals, that requires multiple track circuits. In which case, it is likely to be seen to be better to move to track circuit block with automatic signals between the remaining signal boxes. This was the method used on Western Region in the run up to the big (for then) MAS PSB schemes.
Both because it allowed far more signal boxes to be closed without reducing the line capacity and because it made re-control to a MAS PSB a whole lot easier when the time came.
Both because it allowed far more signal boxes to be closed without reducing the line capacity and because it made re-control to a MAS PSB a whole lot easier when the time came.