Yes
Cooking oil can be brought on the train. It is not a prohibited item.
These items are not allowed to be carried on the train
1. Items prohibited or restricted from transport by the state;
2. Dangerous goods, ammunition and chemical products whose nature cannot be determined by the carrier as specified in laws, regulations and rules; (specified in laws, regulations and rules) Dangerous goods, ammunition and chemical products whose nature cannot be determined by the carrier mainly include: guns and bullets, explosives, control equipment, flammable and explosive goods, poisonous goods, corrosive goods, radioactive goods, infectious disease pathogens, and other hazardous trains Operation safety, and other items that are prohibited from being carried or transported as stipulated in national laws, administrative regulations, and rules)
3. Animals and other items that impede public health ( Including items with foul odors;
4. Items that can damage or contaminate the vehicle;
5. Items whose size or weight exceeds the luggage description.