25-07-2011, 09:30 PM
Functionally as per any other track circuit; if a vehicle goes where is shouldn't (off the road at trap points or displacing a sliding bufferstop) then the TCI is broken by the wheel flange and drops a repeat relay. Older installations would make this appear as a track circuit failure to the interlocking and signaller; more modern places treat it as a bespoke input.
Whereas the old practice would just to have connected the TCI in series with the track feed via the rails to the track relay, this would never be done for TI21 (now renamed Ebitrack 200 in the "digital version"), since these are frequency tracks and not suitable re the impedance.
Whereas the old practice would just to have connected the TCI in series with the track feed via the rails to the track relay, this would never be done for TI21 (now renamed Ebitrack 200 in the "digital version"), since these are frequency tracks and not suitable re the impedance.
(25-07-2011, 08:17 PM)Archie Wrote: what are the workings of an interruptor on a TI track?
Many thanks
PJW