Signals

THE SIGNAL BOX


Railway signalling discussion

AOCL+B or ABCL

Discussion concerning level crossings

AOCL+B or ABCL

Unread postby Peter Gibbons » Mon Jul 3, 2017 9:48 pm

Can anyone explain the differences between these two types of crossings, please?

In the Network Rail electronic Kent, Sussex and Wessex Sectional Appendix it shows that the level crossing at Winchelsea (East Sussex) is now an AOCL+B. It was formerly an AOCL crossing.

Yet the same publication shows Yalding Crossing (Kent) as an ABCL. It too was formerly an AOCL crossing.

To me it seems that the way both types of crossing work is identical.

Thank in advance, to anyone who can answer my query.
Peter G
User avatar
Peter Gibbons
Branch line box
Branch line box
 
Posts: 146
Joined: Fri Nov 9, 2007 1:07 pm
Location: Hassocks, West Sussex

Re: AOCL+B or ABCL

Unread postby AN106 » Tue Jul 4, 2017 6:49 am

Peter Gibbons wrote:Can anyone explain the differences between these two types of crossings, please?

In the Network Rail electronic Kent, Sussex and Wessex Sectional Appendix it shows that the level crossing at Winchelsea (East Sussex) is now an AOCL+B. It was formerly an AOCL crossing.

Yet the same publication shows Yalding Crossing (Kent) as an ABCL. It too was formerly an AOCL crossing.

To me it seems that the way both types of crossing work is identical.

Thank in advance, to anyone who can answer my query.


As I understand it, an AOCL+B uses the existing AOCL circuitry, and adds additional circuitry to control the barriers. If an AOCL crossing such as Yalding is replaced with an ABCL, all the existing circuitry would have been recovered (with the possible exception of track relays, etc.) and new circuitry put in instead. I must admit I've never worked on AOCL+B crossings, but I suspect they don't meet all the standards of an ABCL, which is why they are only a temporary arrangement.
User avatar
AN106
Crossing box
Crossing box
 
Posts: 50
Joined: Fri Apr 30, 2010 7:50 am


Return to Level crossings

Who is online

Users browsing this forum: No registered users and 4 guests