Indeed. But slotted signals in what is quite close to the traditional AB sense must be quite unusual on bi-directional TCB lines worked by mutual acceptance levers (/switches).John Hinson wrote:That is the typical arrangement with slotted signals.
S2595/ wrote:My point is if the CO signal is used, it will not clear until the train has been brought almost to a stand at it. If all trains are accepted full line clear from WSH, how can Tunnel Jcn know whether they need to check the train at their home up to their slotted starter/WSH Home/CO in this circumstance?
S2595/ wrote:Heres the scenario I'm thinking of. I am the signalman at WTJ and have a train on line from Droitwich, offer it to WSH and it is accepted full line clear (always) Then I would pull the up home (a semaphore signal) and the slot lever which is my starter/WSH Home. The platform at WSH is occupied so that slotted signal isnt going to show yellow is it. Therefore will the driver not see yellow distant, green home (without being checked), red slotted starter/WSH home until the CO comes off. Isnt that wrong?!
S&TEngineer wrote:I am suprised that intermixing colourlight signals in a predominatly mechanical signalled area is thought a good idea. This can create further SPAD traps. Hope they did a thourough risk assessment.........
S2595/ wrote:IF the up home at Tunnel Jcn is replaced by a colour light which is approach controlled when TJ6/WSH2/3 is at red then of course there is no problem. But from all the discussions over the years I've heard on this, no one ever mentioned TJ 5/7/22 being replaced. Relying on drivers to acknowledge the meaning of a fixed distant evidently does not work, given the number of times SH2 has been passed at danger.
I agree with John - do the new arrangements really need to be so constrained by the past?Fast Line Floyd wrote:Under semaphore signalling the WSH distants from tunnel junction are all fixed at caution therefore the replacement colourlight home signal at Tunnel Junction will only ever show red and yellow and will be approach released from red unless TJ6 has been cleared.
Users browsing this forum: No registered users and 3 guests