Tank Wagon

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Level 1
Level 2
Level 3
Basic starting train when playing endless. from left to right: Crafter, Storage, Tank, Standard steam engine.
Both the tank wagon and the bucket will be filled up when it's raining.

The tank wagon keeps the train engine cooled. It is 1 of the 3 essential starting wagons that generate upon starting a game. The function of a tank wagon depends on the biome.

In biomes with air, a full tank begins as a vibrant blue and gradually turns red as it heats up. To keep the tank wagon cool, players must fill the water bucket with water and approach either the tank wagon itself or the train engine. When the tank is completely red, the train will then catch on fire. The fire will spread to nearby wagons, making them cease functioning until the fire is put out. The tank is also cooled down by rain.

In biomes without air, the water tank instead provides oxygen in a large radius.

A tank wagon can be upgraded twice in Endless game mode. If players upgrade this wagon, the next iteration will yield a higher capacity water tank making it so that it doesn't need to be cooled as often, as well as increasing the radius of oxygen around it.


Each wagon (except for the water wagon) has a hidden heat capacity of 15s. If a nearby wagon is on fire for a total of 15s, then the wagon will catch on fire as well. If the two wagons on both sides are on fire at the same time, then the wagon will be on fire in 7.5s. The heat capacity does not reset even if you put out all the fire on the train. Meaning if you let the engine burn for 10s and then put out the fire and let it burn again, then the fire will spread to the first wagon in 5s. Rain and the shop can reset the hidden heat capacities for all wagons.

The engine has a hidden heat capacity of 30s, and the water wagon can increase the heat capacity of the engine. If the first wagon is on fire, it can heat up the engine as well. For example, with a level 1 water wagon, the engine's heat capacity should last for 60s, however, if the player only puts out the fire on the engine without putting out the fire on the first wagon, then the engine will catch on fire in 30s. Water wagons cannot be heated up by nearby wagons.

Endless Strategy

Swapping the crafting wagon and the tank wagon after the first station is recommended, due to the importance of tracks and because then the train can be cooled down at the front and at the back.

Bringing the tank wagon forward for biomes without air will help with oxygen management.

Moving the Tank to the front/back is possible within the shop. Simply pickup the Tank and drop it in place of the chosen wagon once you connect your train to the first station.

Time mode strategy

Be aware that heat capacity cannot be rest in time mode unless it rains. If the player completes a "let the train burn for 10s" task, that would mean the heat capacity of the wagons near the engine and the water wagon only have less than 5s of heat capacity. Making the train burn again will cause fire to spread faster than expected.


Capacity Capacity

tank + engine*


(+30 seconds/lvl)


tank + engine*

Space Radius

(+1.6 meters/lvl)

Bolt Cost | N° of  


Box Cost + N° of  

(Time Mode)

LVL 1 100% (=30s) 100% (=60s) 30s 60s 3   None   0
LVL 2 200% 150% 60s 90s 4.6   2   1
LVL 3 300% 200% 90s 120s 6.2   2   2
LVL 4 400% 250% 120s 150s 7.8   2+ | 1x     3
LVL 5 600% 300% 150s 180s - 3min 9.4   3+ | 2x     4
LVL 6 700% 350% 180s - 3min 210s 11   6+ | 3x     5
LVL 7 800% 400% 210s 240s - 4min 12.6   8+ | 4x     6
LVL 8 900% 450% 240s - 4min 270s 14.2   13+ | 5x     7
LVL 9 1000% 500% 270s 300s - 5min 15.8   16+ | 6x     7 + 1x  
LVL 10 1100% 550% 300s - 5min 330s 17.4 /   7 + 2x  
* The engine adds 30s to the timer.