HOI4 Dev Diary - Railway guns never tire

Hello there, C0RAX again.

It’s time again to reveal some more secret information that was hinted at in the last dev diary. Specifically this week will be revolving around the final part of railways and trains. So without any more need for introduction here are our stars of the show today.

The railway guns.

So to start off I'll go through how you get a railway gun on the map because it’s a little different to normal land units. First of all you are going to want to research railway guns which comes after armoured trains.
pasted image 0.png

Then you can find it in your production tab just like building normal equipment. But unlike other equipment you build, these production lines are limited to 5 factories and the railway gun won't be added to your stockpile.
pasted image 0 (1).png


Instead, once completed, your brand new railway gun will appear in your capital, in this way they are built similar to capital ships.
pasted image 0 (2).png


Moving your railway gun is limited to provinces with railways, and so to get to the front you must have a rail connection. Taking into account the rail conversion time when capturing territory is important as you will have to wait for the big guns to be able to help you out.
pasted image 0 (3).png


You can also attach railway guns to armies just like with planes and they will attempt to place themselves relative to the frontline. If you have several, they will be distributed where possible to support your army. There is also a quick select button on the army to select all railways guns attached to an army should you need to.
pasted image 0 (4).png
pasted image 0 (5).png

Finally, the last bit of control understanding is range. Railway guns have a range in which they can support and so from any one point are limited in which provinces they can support. This range is shown by hovering over the unit icon.
pasted image 0 (6).png


On to combat now, here we can see a combat with a supporting railway gun, we have added the useful icon on the combat progress indicator that there is a supporting bombardment. This new icon will also show if there is shore bombardment happening in the combat.
pasted image 0 (7).png


The combat effects of railway gun bombardment work just like shore bombardment, causing negative combat stat modifiers to those on the receiving end of the big guns. These modifiers affect both soft and hard attack as well as defense values. Notably, these effects do not stack - it becomes more important to spread out your railway artillery than to concentrate it.
pasted image 0 (8).png


Finally we need to talk about capture and damage, railway guns can be captured via encircling them and damaged by damaging the railway they are placed upon.

Now railway guns are the biggest guns by far used on land and so it's important that we have representations of those built by the major powers. So now we look at the unique guns for the major powers.

This is the German Schwerer Gustav model you will see when playing as the Germans. It's perhaps the most famous railway gun and definitely the biggest and so had to have a part in this feature.
pasted image 0 (10).png

This is the BL 9.2inch railway gun, a relic of the first world war but these big guns were kept in service until 1945.
pasted image 0 (11).png


Following that we have the French Canon de 305 another veteran of the first world war.
pasted image 0 (12).png


Next up is the USA’s 8-inch Mk. VI which remarkably first entered service as late as 1941!
pasted image 0 (13).png


Type 90 240 mm railway gun whose claim to fame is being destroyed by the retreating Japanese in the soviet invasion manchuria.
pasted image 0 (14).png


And finally the TM-3-12, three of these were made in 1938 and were used in the winter war against finland, unbelievably these where in service until 1999 (a whopping 61 years of service)
pasted image 0 (15).png


Finally here's a cool clip of the Schwerer Gustav firing in game.
Railway-1.gif
 
Last edited:
  • 165Like
  • 89Love
  • 12
  • 7
  • 5
Reactions:

Teo41

Major
54 Badges
Nov 13, 2011
616
462
  • Darkest Hour
  • Stellaris - Path to Destruction bundle
  • Stellaris: Leviathans Story Pack
  • Semper Fi
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III
  • For the Motherland
  • Stellaris: Apocalypse
  • Stellaris: Federations
  • Steel Division: Normandy 44
  • Hearts of Iron IV: La Resistance
  • Europa Universalis IV: Mandate of Heaven
  • Stellaris: Nemesis
  • Surviving Mars
  • Hearts of Iron IV: Death or Dishonor
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Europa Universalis IV: Rule Britannia
  • Steel Division: Normandy 44 -  Back to Hell
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Distant Stars
  • Europa Universalis IV: Dharma
  • Stellaris: Necroids
  • Stellaris: Lithoids
  • Europa Universalis IV: Golden Century
  • Stellaris: Ancient Relics
  • Battle for Bosporus
  • Europa Universalis IV: Mare Nostrum
  • Europa Universalis IV
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Pre-order
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Hearts of Iron IV: Together for Victory
  • Stellaris
  • Stellaris: Galaxy Edition
  • Hearts of Iron IV Sign-up
  • Europa Universalis IV: Rights of Man
  • Stellaris: Digital Anniversary Edition
  • Stellaris: Galaxy Edition
  • Stellaris: Galaxy Edition
  • Steel Division: Normand 44 - Second Wave
  • Stellaris: Synthetic Dawn
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV: Res Publica
  • Europa Universalis IV: Call to arms event
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Conquest of Paradise
Interesting! I seriously can't wait to siege Sevastopol with the Schwerer Gustav! :p
 
  • 9Like
  • 1Love
  • 1
Reactions:

A. Blackthorn

Byzanteen
26 Badges
Jul 15, 2013
206
268
  • Crusader Kings II: Charlemagne
  • Crusader Kings II
  • Europa Universalis IV: Art of War
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Res Publica
  • Sengoku
  • Europa Universalis IV: Pre-order
  • Crusader Kings III: Royal Edition
  • Crusader Kings III
  • Age of Wonders: Planetfall
  • Imperator: Rome Sign Up
  • Imperator: Rome
  • Imperator: Rome Deluxe Edition
  • Europa Universalis IV: Golden Century
  • Europa Universalis IV: Rule Britannia
  • Surviving Mars
  • Europa Universalis IV: Mandate of Heaven
  • Europa Universalis IV: Rights of Man
  • Hearts of Iron IV: Cadet
  • Stellaris
  • Europa Universalis IV: Cossacks
  • Europa Universalis IV: Common Sense
  • Crusader Kings II: Way of Life
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV
  • Crusader Kings II: The Old Gods
Railway gun to heaven!
 

TheNewIKB

Corporal
14 Badges
Mar 6, 2017
34
28
  • For the Motherland
  • Hearts of Iron III
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III Collection
  • Semper Fi
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV: Colonel
  • Hearts of Iron IV: Together for Victory
  • Hearts of Iron IV: Death or Dishonor
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: La Resistance
  • Battle for Bosporus
Boom boom boom boom,
I want to put a great big shell in your room...
 
  • 9Haha
  • 1Like
Reactions:

Oddb@ll

Monkey
51 Badges
Sep 26, 2007
1.164
1.268
  • Crusader Kings II
  • Europa Universalis IV: Third Rome
  • Stellaris - Path to Destruction bundle
  • Europa Universalis IV: Pre-order
  • Victoria 2: Heart of Darkness
  • Victoria 2: A House Divided
  • Europa Universalis IV: Res Publica
  • Iron Cross
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III Collection
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Conquest of Paradise
  • Europa Universalis IV: Art of War
  • Hearts of Iron Anthology
  • Europa Universalis IV: Cradle of Civilization
  • Stellaris: Nemesis
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Stellaris: Apocalypse
  • Europa Universalis IV: Rule Britannia
  • Stellaris: Distant Stars
  • Europa Universalis IV: Dharma
  • Europa Universalis IV: Golden Century
  • Hearts of Iron IV: Expansion Pass
  • Imperator: Rome Sign Up
  • Stellaris: Ancient Relics
  • Stellaris: Lithoids
  • Hearts of Iron IV: La Resistance
  • Stellaris: Federations
  • Battle for Bosporus
  • Stellaris: Necroids
  • Hearts of Iron IV: Colonel
  • Europa Universalis IV
  • Victoria 2
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Europa Universalis IV: Mare Nostrum
  • Stellaris
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV: Field Marshal
  • Europa Universalis IV: Rights of Man
  • Stellaris: Digital Anniversary Edition
  • Stellaris: Leviathans Story Pack
  • Steel Division: Normandy 44
  • Europa Universalis IV: Mandate of Heaven
  • Hearts of Iron IV: Death or Dishonor
  • Stellaris: Synthetic Dawn
  • Stellaris: Megacorp
Hmm do the railway guns provide the stat in all types of combat? Weren't they ineffective in regular combat and only (slightly) useful against fortified positions like in Sevastopol?
 
  • 20Like
  • 5
  • 3
Reactions:

Teo41

Major
54 Badges
Nov 13, 2011
616
462
  • Darkest Hour
  • Stellaris - Path to Destruction bundle
  • Stellaris: Leviathans Story Pack
  • Semper Fi
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III
  • For the Motherland
  • Stellaris: Apocalypse
  • Stellaris: Federations
  • Steel Division: Normandy 44
  • Hearts of Iron IV: La Resistance
  • Europa Universalis IV: Mandate of Heaven
  • Stellaris: Nemesis
  • Surviving Mars
  • Hearts of Iron IV: Death or Dishonor
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Europa Universalis IV: Rule Britannia
  • Steel Division: Normandy 44 -  Back to Hell
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Distant Stars
  • Europa Universalis IV: Dharma
  • Stellaris: Necroids
  • Stellaris: Lithoids
  • Europa Universalis IV: Golden Century
  • Stellaris: Ancient Relics
  • Battle for Bosporus
  • Europa Universalis IV: Mare Nostrum
  • Europa Universalis IV
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Pre-order
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Hearts of Iron IV: Together for Victory
  • Stellaris
  • Stellaris: Galaxy Edition
  • Hearts of Iron IV Sign-up
  • Europa Universalis IV: Rights of Man
  • Stellaris: Digital Anniversary Edition
  • Stellaris: Galaxy Edition
  • Stellaris: Galaxy Edition
  • Steel Division: Normand 44 - Second Wave
  • Stellaris: Synthetic Dawn
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV: Res Publica
  • Europa Universalis IV: Call to arms event
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Conquest of Paradise
@C0RAX will railway guns provide extra bonuses against fortifications and urban provinces?
 
  • 27Like
Reactions:

Teo41

Major
54 Badges
Nov 13, 2011
616
462
  • Darkest Hour
  • Stellaris - Path to Destruction bundle
  • Stellaris: Leviathans Story Pack
  • Semper Fi
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III
  • For the Motherland
  • Stellaris: Apocalypse
  • Stellaris: Federations
  • Steel Division: Normandy 44
  • Hearts of Iron IV: La Resistance
  • Europa Universalis IV: Mandate of Heaven
  • Stellaris: Nemesis
  • Surviving Mars
  • Hearts of Iron IV: Death or Dishonor
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Europa Universalis IV: Rule Britannia
  • Steel Division: Normandy 44 -  Back to Hell
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Distant Stars
  • Europa Universalis IV: Dharma
  • Stellaris: Necroids
  • Stellaris: Lithoids
  • Europa Universalis IV: Golden Century
  • Stellaris: Ancient Relics
  • Battle for Bosporus
  • Europa Universalis IV: Mare Nostrum
  • Europa Universalis IV
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Pre-order
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Hearts of Iron IV: Together for Victory
  • Stellaris
  • Stellaris: Galaxy Edition
  • Hearts of Iron IV Sign-up
  • Europa Universalis IV: Rights of Man
  • Stellaris: Digital Anniversary Edition
  • Stellaris: Galaxy Edition
  • Stellaris: Galaxy Edition
  • Steel Division: Normand 44 - Second Wave
  • Stellaris: Synthetic Dawn
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV: Res Publica
  • Europa Universalis IV: Call to arms event
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Conquest of Paradise
Last edited:

PurpulaPhoenixum53

Lt. General
43 Badges
Oct 8, 2016
1.333
1.738
  • Crusader Kings II
  • Cities: Skylines - After Dark
  • Crusader Kings II: The Republic
  • Crusader Kings II: Sword of Islam
  • Europa Universalis IV
  • Crusader Kings II: Jade Dragon
  • Europa Universalis IV: Third Rome
  • Europa Universalis IV: Pre-order
  • Europa Universalis IV: Res Publica
  • Europa Universalis IV: Wealth of Nations
  • Hearts of Iron IV: Together for Victory
  • Europa Universalis 4: Emperor
  • Crusader Kings II: Monks and Mystics
  • Europa Universalis IV: Mandate of Heaven
  • Hearts of Iron IV: Death or Dishonor
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Rule Britannia
  • Cities: Skylines - Parklife
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Dharma
  • Crusader Kings II: Holy Fury
  • Europa Universalis IV: Golden Century
  • Hearts of Iron IV: Expansion Pass
  • Battle for Bosporus
  • Crusader Kings II: Reapers Due
  • Europa Universalis IV: Conquest of Paradise
  • Cities: Skylines
  • Europa Universalis IV: El Dorado
  • Crusader Kings II: Way of Life
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Crusader Kings II: Conclave
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV: Rights of Man
  • Europa Universalis IV: Art of War
  • Europa Universalis IV: Call to arms event
  • Crusader Kings II: Charlemagne
  • Crusader Kings II: Legacy of Rome
  • Europa Universalis IV: Mare Nostrum
  • Crusader Kings II: The Old Gods
  • Crusader Kings II: Sons of Abraham
  • Hearts of Iron IV: La Resistance
Nice! Although the pictures for the French and German rail guns aren't working on my end.

Will railway guns have any sort of bonuses towards any type of terrain?

Edit: Reloaded the page and they're working now!

Edit 2: Reloaded the page again, they're broken again. :(
 
Last edited:
  • 6Haha
  • 1Like
  • 1
  • 1
Reactions:

pheonicia

Lt. General
81 Badges
Feb 2, 2015
1.404
2.302
  • Stellaris - Path to Destruction bundle
  • Stellaris: Megacorp
  • Hearts of Iron IV: Together for Victory
  • Stellaris
  • Stellaris: Galaxy Edition
  • Crusader Kings II: Holy Fury
  • Hearts of Iron IV Sign-up
  • Stellaris Sign-up
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV: Colonel
  • Battle for Bosporus
  • Europa Universalis IV: Rights of Man
  • Stellaris: Digital Anniversary Edition
  • Stellaris: Leviathans Story Pack
  • Cities: Skylines - Natural Disasters
  • Crusader Kings II: Conclave
  • Crusader Kings II: Monks and Mystics
  • Cities: Skylines - Mass Transit
  • Europa Universalis IV: Mandate of Heaven
  • Europa Universalis IV: Golden Century
  • BATTLETECH
  • Surviving Mars
  • Steel Division: Normand 44 Sign-up
  • Hearts of Iron IV: Death or Dishonor
  • Age of Wonders: Planetfall Premium edition
  • Cities: Skylines - Green Cities
  • Imperator: Rome Sign Up
  • Cities: Skylines - Parklife
  • Stellaris: Apocalypse
  • Stellaris: Humanoids Species Pack
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Rule Britannia
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Cradle of Civilization
  • Europa Universalis IV
  • Age of Wonders: Planetfall Deluxe edition
  • Stellaris: Ancient Relics
  • Cities: Skylines - Campus
  • Age of Wonders: Planetfall
  • Cities: Skylines - Snowfall
  • Cities: Skylines
  • Cities: Skylines Industries
  • Europa Universalis IV: El Dorado
  • Imperator: Rome
  • Crusader Kings II: Way of Life
  • Pillars of Eternity
  • Europa Universalis IV: Common Sense
  • Crusader Kings II: Horse Lords
  • Imperator: Rome Deluxe Edition
  • Europa Universalis IV: Dharma
Hmm, I could see these sorts of mechanics used for wonder weapons in the future. Something like the ratte.
 
  • 11
  • 4Like
Reactions: