Can I give a red envelope to the interviewer of the railway bureau?

You can't. As a state-owned enterprise, the recruitment and interview process of the railway bureau is usually carried out in accordance with formal procedures, and sending red envelopes is likely to be regarded as unfair competition, even violating the company's regulations and policies. In the interview process, the interviewer usually evaluates the candidates according to their professional ability, comprehensive quality and personal performance, rather than deciding whether to hire them through bribery. So you can't give a red envelope to the railway bureau interviewer.