28-09-2014, 07:23 PM
(This post was last modified: 29-09-2014, 04:58 PM by dorothy.pipet.)
I'm not all that clued up but ... avoids all point machines drawing maximum power load at once.
In UK mainline it is rare to provide sequential proving for A, B, ends of the same points. OTOH SSI style interlockings are generally configured to stager point calls to the different Sets of points very slightly.
There are probably other advantages.
In UK mainline it is rare to provide sequential proving for A, B, ends of the same points. OTOH SSI style interlockings are generally configured to stager point calls to the different Sets of points very slightly.
There are probably other advantages.