No more than 22 centimeters are allowed.

Through the train security check, as long as the knife can endanger personal safety are prohibited to carry. According to the "Railway Station Station and train prohibited and restricted items to carry the announcement" provisions, it is prohibited to carry daggers, three-pronged knife (including machining three-pronged scraper), with self-locking device of the spring knife, and other similar single-edged, double-edged knives and other controlled knives;

1, daggers: with a hilt, knife compartment and the blood groove, the tip angle of the knife less than 60 degrees of the single-edged, double-edged or multi-bladed sharp knife;

2, three-pronged scraper: machining knives with three blades;

3, spring-loaded knives with self-locking device (jumping knife): after the knife body unfolds or pops out, it can be fixed by the spring in the hilt or the card lock to self-locking folding knives;

4, other similar single-edged, double-edged, three-pronged sharp knives: the angle of the tip of the knife is less than 60 degrees, and the knife body length of more than 150 mm of various types of single-edged, Double-edged and multi-bladed knives;

Expanded

The State Railway Administration relevant person in charge emphasized that the peak of the Spring Festival is approaching, the railroad transport enterprises in strict accordance with the "Railway Safety Management Regulations", "Railway Passenger Transportation Safety Inspection Management Measures" and the "State Railway Administration, the Ministry of Public Security on the release of the railroads & lt; prohibited to carry the goods directory & gt; the announcement" and other provisions of the requirements, and effectively strengthen the safety inspection of passenger carry items,

And in the railroad station, train and other places through a variety of ways to publicize the announcement, to obtain the majority of travelers' understanding and support. Railroad passengers should consciously accept and cooperate with the safety inspection work of the railroad transport enterprises, railroad administrative supervision and public security departments to carry out safety supervision and inspection duties in accordance with the law, all aspects *** with efforts to maintain good order in railroad transport to ensure the safety of railroad passenger transport.

Source of reference

Baidu Encyclopedia - Prohibited items catalog