You can put spiders in minecarts in Minecraft. In vanilla Minecraft, the behavior depends on how the cart and mob interact.
TrainCarts gives you much more control over whether spiders can enter, stay in, or leave a cart. Spiders are a useful test case because they are large, mobile mobs that interact with collision and cart entry in ways that feel inconsistent in normal play.
What Works In Vanilla Minecraft Vs TrainCarts
In vanilla Minecraft, minecarts can carry mobs, and mobs can enter when they collide with a cart under the right conditions. TrainCarts lets you set entry rules, so you are not stuck guessing when spiders or other mobs will hop in.
Why Spider Transport Behaves Differently In Vanilla
Vanilla Minecraft minecarts rely on normal mob movement, cart position, and collision. A spider may enter a cart if it walks into it, yet that can feel inconsistent because spiders climb, turn, and move differently from calmer mobs.
The Minecart behavior also depends on cart state, track shape, and whether the cart is already occupied. Your result can change a lot based on timing and placement.
How TrainCarts Changes Minecart Mob Entry
TrainCarts gives you clearer control over whether mobs enter a cart. You can define how your minecarts accept mobs and how your trains behave on rails.
This makes TrainCarts a better fit when you want repeatable transport for spiders, jockeys, or other mobs that do not always behave the same way in vanilla.
Enable Mob Entry For A Selected Train
With TrainCarts, you can turn mob entry on for just one train instead of changing every cart you place. That makes it much easier to test spiders safely and keep your other carts unchanged.
Use /train collision mobs enter
Select the train, then use /train collision mobs enter to allow mobs to enter that train. The command ties directly to the train’s collision settings, so the cart can accept mob entry instead of only relying on physical bumping.
The same idea applies to collision mobs enter, mobs: enter, and monster: enter style rules, depending on how your train is configured. When you want spiders to enter, this is the part of the setup that matters most.
How The Collision Property Controls Entering
The collision property controls what happens when a mob touches the train. If mob entry is enabled, the train can accept a spider during collision instead of blocking it.
That matters because spiders are not passive animals, so you want a rule that matches the mob type you plan to move. Once the collision setting is right, your cart behavior becomes much easier to predict.
Set Default Behavior For New Minecarts
If you want new carts to work the same way every time, set the default behavior before you build your rail system. That saves you from editing each cart one by one later.
Edit DefaultTrainProperties.yml
Edit defaulttrainproperties.yml or plugins/train_carts/defaulttrainproperties.yml to change the default behavior for new trains. This file controls the defaulttrainproperties settings that TrainCarts uses when a cart is created.
If your goal is spider transport, this is the place to make mob entry the default instead of a manual toggle.
Choose Default, Admin, Or Spawner Rules
TrainCarts can separate default, admin, and spawner signs rules, so different cart types can behave differently. That gives you a clean way to let normal carts act one way while protected or special carts use train.properties.admin.
You can also apply settings to saved trains, which helps keep your spider haulers consistent after you store and reuse them.
Reload Changes Without Restarting
After editing the file, use /train globalconfig reload --defaulttrainproperties to load the changes again. You can test the new settings right away without restarting your server.
Choose The Right Mob Categories For Spiders And Other Mobs
You get the best results when you match your rules to the right mob category. Spiders do not always fit the same transport logic as farm animals, pets, or bosses.
When To Use Mobs, Animal, Or Monster
Use mobs when you want broad cart entry rules for many entity types. Use animal mobs or passive mobs when you only want calm creatures, and use monster mobs or hostile mobs when you want spiders and similar threats.
This is useful because spiders are monster and hostile, not animal or passive. You can also think in terms of neutral mobs when your setup needs a wider middle ground.
Special Cases Like Jockeys, Pets, NPCs, And Bosses
Some entities need extra care. A jockey or jockey mounts setup can combine mobs in ways that change how entry works.
A pet or tameable mob may need different rules from wild creatures. npc, utility mobs, and boss mobs behave differently from normal creatures.
If you set up mixed transport, keep tameable animals, passive animal mobs, and hostile monster mobs separate. This approach keeps your spider cart rules clean and easy to manage.
