Factorio Forums

Hi,

In this roundabout, the train cannot find its path to the station.

• - The station is after the red arrow.
  - If I put the train on the red arrow, it goes to the station smoothly.
  - I I drive manually, it also work.

I have no clue why this roundabout doesn't work.

At the 11 o'clock position (and 3 mirrored positions) the chain signal is on the wrong side.

Indeed. Actually, it's quite impressive to spot that.

I fixed it, it works now, thanks.

DaveMcW wrote:At the 11 o'clock position (and 3 mirrored positions) the chain signal is on the wrong side.

Lot of places really.

4 places where the chain is in the wrong side:

Seeing this roundabout style a lot recently. I cant help but feel that the outer loop needs to be big enough to park 1 whole train on the corners.

Shokubai wrote:Seeing this roundabout style a lot recently. I cant help but feel that the outer loop needs to be big enough to park 1 whole train on the corners.

Not really, since the outer loop is entirely chain signalled.

Edit: That said, since this 2x 1-way to 2x 1-way junction, the entire outer loop is actually unnecessary.

Frightning wrote:

Shokubai wrote:Seeing this roundabout style a lot recently. I cant help but feel that the outer loop needs to be big enough to park 1 whole train on the corners.

Not really, since the outer loop is entirely chain signalled.

Edit: That said, since this 2x 1-way to 2x 1-way junction, the entire outer loop is actually unnecessary.

Because it is chain signaled, 2 trains trying to exit the same path (regardless of entry point) will not take the inside and outside path as they can not reach the exit while the chain is occupied. A train COULD choose one of the other 2 exits if it was going that way assuming it didn't cross the first but it's going to sit on the main path until a route through opens up. By giving the train parking room on the outer loop it has what amounts to a waiting bay where it could make some progress and stop without blocking other trains.

Still...This style is proving no more effective than the single roundabout design for throughput. MAYBE its a 20% boost to throughput but then I am allowing trains to stay in the junction longer, tying up chain signals, so perhaps it's more like 10% in the right environment.

It's time for a good bridge mod...

I suppose it's total overkill (as it is with chain signals).
All those redundant loops aren't useful at all, as far as I understand. In fact, they probably can be easily removed without any loss, leaving only one roundabout loop.
Or, better, they really should be longer, with regular block signals. It could help then.