Basic Layouts

[NIR]

The basic single line terminus for passenger and freight is well understood - a loop and one siding - but what about the basic junction?

Passenger bay with free running past but limitation getting a freight onto or off the branch.

Edited August 15, 2020 by NIR

[jhb171achill]

In operation, a crossover is more likely the other way round and to the right of the junction points, thus enabling a train from the right to go directly onto the branch....

Edited August 15, 2020 by jhb171achill

[NIR]

That would be a facing crossover though, be cautious!

[jhb171achill]

14 minutes ago, NIR said:

That would be a facing crossover though, be cautious!

Yes, but if a train is coming from the right, and going up the branch, he needs to be able to get across without reversing.......

[NIR]

The basic terminus (the basic single line terminus is just a special case of this)

Needs a facing crossover to allow concurrent arrivals/departures and runaround, though their order could be reversed...

...to limit facing moves but I suspect it all comes down to whether you want to prioritise arrivals or departures when signalling an intense service.

Edited August 15, 2020 by NIR

[hexagon789]

4 hours ago, jhb171achill said:

Yes, but if a train is coming from the right, and going up the branch, he needs to be able to get across without reversing.......

Trying to think of examples, but didn't Ballybrophy require reversal off the mainline to gain the line to Limerick via Nenagh from the Cork line for Dublin-Limerick trains when the Nenagh line was the mainline to Limerick?

 

Also, the Midland Railway in Great Britain studiously avoided facing points wherever possible, Garsdale on the Settle & Carlisle required a double reversal to gain the branch to Hawes from the bay platform for example.

 

Not sure if any Irish railway companies followed the same practice as the British Midland?

[NIR]

4 hours ago, jhb171achill said:

Yes, but if a train is coming from the right, and going up the branch, he needs to be able to get across without reversing.......

That's only really required for through passenger workings. A freight from the right is easier than one from (or to) the left though.

Edited August 15, 2020 by NIR

[NIR]

48 minutes ago, hexagon789 said:

Not sure if any Irish railway companies followed the same practice as the British Midland?

Yes these are just functional, not prototypical to a company or era, but there's a lot more of it around these days.

[hexagon789]

Just now, NIR said:

Yes these are just functional, not prototypical to a company or era, but there's a lot more of it around these days.

I get that, just wondered if there was a prototype for it as such.

[jhb171achill]

The norm was facing points to a junction both here and Britain. 

Naturally there were exceptions, but usually for a practical reason. Ballybrophy was exceptional as it faced Cork rather than Dublin.

Take Mallow as a better example. You could come up from Cork and go direct onto the Waterford line. That was the norm.

An example like the plan above gives more shunting possibilities on a small layout, of course!

[NIR]

Antrim onto the Lisburn line looks like a good example, access via the right hand line from somewhere on the other side of the station back when Belfast-Ballymena was double track, and there's even a passenger bay!

(Parting Shot/N Johnston)

Edited August 15, 2020 by NIR

[hexagon789]

2 hours ago, jhb171achill said:

The norm was facing points to a junction both here and Britain. 

Naturally there were exceptions, but usually for a practical reason. Ballybrophy was exceptional as it faced Cork rather than Dublin.

Take Mallow as a better example. You could come up from Cork and go direct onto the Waterford line. That was the norm.

An example like the plan above gives more shunting possibilities on a small layout, of course!

Sorry, I didn't mean time imply facing points were the exception just that there's a few interesting examples where junction access is trailing against the direction of the main traffic flow

1 hour ago, NIR said:

Antrim onto the Lisburn line looks like a good example, access via the right hand line from somewhere on the other side of the station back when Belfast-Ballymena was double track, and there's even a passenger bay!

(Parting Shot/N Johnston)

Nice somersaults

[Galteemore]

If modelling the steam era, don’t forget your Facing Point Locks if the turnout will be traversed by passenger carrying stock. 

[NIR]

The junction with minimal access, the terminus with no capacity for tidal flow, both clearly reductions to absurdity but perhaps of some value when compressing things into an essence.

Everything else? Well that's easy

Edited August 15, 2020 by NIR

[Robert Shrives]

Small brook junction to Ryde on the IOW was in winter time was run as a pair of parallel single lines with the scissors junction out of use.

If you take it that point work off scene - hinted at by signals visible then just two lines as above quite feasible.  

By some careful signage you could imply one line was bidirectional with a cross over off stage left and the single lead turnout off stage right , like Cherryville .

Equally if you placed a platform between the lines you could do a Manulla junction.

I get my coat ! 

Robert