Factorio Forums

Rseding91 wrote: The entire collection of rail logic is built on them always colliding when built physically over each other. The underground belt logic has several extra checks all over the belt logic to make them work and has been in there for quite some time.

Retroactively adding that kind of logic to trains is just a huge-HUGE task.

lsc9x wrote: Sun Sep 06, 2020 10:17 pm I don't know, but it sounds like it could be fun. Just make train tunnels a tier 3 research item for rails (like express transport belts) and make them super expensive. So yes, you could run a rail line underground across your entire base, but it's going to cost a huge amount of resources to produce, just like real life!

lsc9x wrote: Sun Sep 06, 2020 10:17 pm Just my two cents:

I wanted to place a rail line across my base and I could do the entire line except for a few chemical plants that were in my way. I thought, if I could just tunnel under them like I could with belts, problem solved! Unfortunately there is no way to do it in 1.0.

Keeping in the spirit of laying rail lines, underground rails (could) have some constraints:

1) Tunnel has to be in a straight line, E/W or N/S. (this should save a ton of development work, maybe...)
2) Tunnel can't go underwater! (or can it?....)
3) Tunnel has a fixed maximum distance (like belts). (or does it?)

I mean laying down a curved rail line that goes under a large lake would be pretty cool, (if not horribly expensive)!

Honestly, I can see why elevated trains and train bridges are not in the game: 1) The first would add little to game play for a massive amount of work. 2) Bridges aren't needed because you can already use land fill and concrete to make a bridge!

But underground train tunnels could add a lot to the game in terms of design.

If you really wanted to go "whole hog" you could figure out a way to place underground rail lines, exactly like above ground rails (like they are in real life) and tunnel under entire cities! Maybe train tunnels are even more flexible than belts when it comes to doing stuff underground. I don't know, but it sounds like it could be fun. Just make train tunnels a tier 3 research item for rails (like express transport belts) and make them super expensive. So yes, you could run a rail line underground across your entire base, but it's going to cost a huge amount of resources to produce, just like real life!

EACH underground rail track could cost you 10 regular rail tracks + 10 steel + 100 concrete +3 pipes +1 blue chip and +1 light (or something similar). So, yes you would be able to tunnel under a lake or under a city in a late stage game, but it's going to be super expensive to do so. Exactly like real life!

Thanks again for all your hard work and have a good one! =)

peace!

TL;DR

What ?

Rules/Specs for Bridges and Tunnels

Example of Possible Use:

Why ?

DaleStan wrote: Fri Dec 09, 2022 6:37 am https://www.google.com/search?q=factorio+train+bridge gives me four different mods, of which I've used none, but one of those will probably do the trick. https://mods.factorio.com/mod/RenaiTransportation also gives you bridge-like things.

The choices for tunnels seem to be https://mods.factorio.com/mod/traintunnels or https://mods.factorio.com/mod/railway_tunnel.

ssilk wrote: Sat Dec 10, 2022 10:20 am merged with existing topic
While doing that also removed the poll. Suggestions are per se non-democratic.

@therber2: there are missing pictures in that article, you need to upload them.

mrvn wrote: Mon Mar 20, 2023 4:06 pm The most simple and most flexible solution is still my suggestion to add a new rail type that comes in connected pairs and each can be placed anywhere on any surface and remain connected.

So the rail line on the map would end at one point with the special connected rail and pick up somewhere else with the other part of the connected rail. For the rail system the two rails are connected just like any other 2 rails and trains path right through it. The normal signal and block rules still apply, both connected rails of a pair are in the same rail block.

Obviously this would have graphics glitches if used on it's own as trains would disappear one wagon at a time when driving across the connected rail pair. But all that can be solved by a modder by providing suitable graphics for tunnel or bridge entrance and exit. There should be nothing new to add to the game engine to make this look pretty.

therber2 wrote: Sun May 07, 2023 2:21 pm

mrvn wrote: Mon Mar 20, 2023 4:06 pm The most simple and most flexible solution is still my suggestion to add a new rail type that comes in connected pairs and each can be placed anywhere on any surface and remain connected.

So the rail line on the map would end at one point with the special connected rail and pick up somewhere else with the other part of the connected rail. For the rail system the two rails are connected just like any other 2 rails and trains path right through it. The normal signal and block rules still apply, both connected rails of a pair are in the same rail block.

Obviously this would have graphics glitches if used on it's own as trains would disappear one wagon at a time when driving across the connected rail pair. But all that can be solved by a modder by providing suitable graphics for tunnel or bridge entrance and exit. There should be nothing new to add to the game engine to make this look pretty.

Yeah after exploring a bunch of code and learning how the train pathing works, I agree: having trains just pass through each other without collision in a specified box which would be the "tunnel" or "bridge" seems like the path of least resistance here.