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Let's see If I can properly draw a Diagram- N===1====================2|------||-----|==3=================4====S Legend: === RR tracks |------||------| Road 1,2,3,4 Insulated Track Joints N,S = North and South So, in accordance with the now outdated system, still used on branch lines and other relativelty quiet Railroads. A train is heading from North to south- As it croses link One, it turns ON the Railway lights- As it croses link 2- it lights a postition marker in the internal working of the logic box for the RR crossings (big silver boxes that contain the workings of the lights etc..) So now the lights know the Front of the train is just heading over the crossing As it croses link 3- The end of the train will shut of the RR lights as the last car pases as the current is disrupted- As it croses link 4- this is the msot important link of all- it creates a closed circuit- 1,2,3,4 have succesfully been passed, and the system is ready for another train. Problems with this system- 1,2,3,4 (north to south) or 4,3,2,1 (south to north) That is the exact order in which the RR lights have to have the train pass over them- In case one breaks for example- and the Train pases over them like so.. 1,<s>2</s>,3,4 Then the RR lights will activate fail-safe, that is when the blasted things chime until the reset button is pressed. Should at any point inbetween link one and four, the track current come undone, the wire pops out, Fail safe again- as it has lost track current. A complete circuit msut be ataiuned- on the odd ocasion, Link 4 may fail to work, so a train will activate on link 1, and shut off on link 4- Now usually the system gives the trin 60 minutes to run link 4, and complete a full circuit- if this link breaks and it times out, failsafe will be activated again- thats a basic description of a single crossing- add a siding or another track or even another road like so N==1========2==|---||---|==3=========4==|------||-------|==5==========6===S then things complicate even more.
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