Specimen answers?

[Peter]

Hi, Peter

With regards to the call-on class route of 615A( C ), I am wondering should the entry of Opposing Route locking TC clear column be written as below, take opposing route 668C for instance,
Route Normal: 668C
Tracks Clear: CH, (BM---
Occ for t: 30s).

I don't understand why tracks AC and AB are involved in the opposing route column. Tracks AC and AB are mentioned in the attempt done by dorothy.

Could you kindly advise?

The route for 668C goes up to 642 signal and 615A( C ) goes up to 645. In order to be able to set 615A( C ), we must either make sure there is no route set over any or all of its route, or that where this had occurred, that route has been used (ie there is not a train moving along that route). This would be either by proving that all the tracks are clear or that the train has come to a stand at a legitimate point in the route for the opposing route to be set. In this case, the train stopping and standing somewhere on the Down Goods (AB or AC track) would be such a place.

Hence the entry would be tracks clear CH, BM, AD, BG*, [AC, AB ..... AC occ or AB occ for Time]

* BG is the shunt overlap and its inclusion would depend on the principles you are applying.


Your entry of BM for time implies that you would expect the train to come to a stand over the points.

Peter (not PJW)