Yes , there are various type of job in railway but that are not related to the your core subject .
TT or TC exam
Railway police force exam
Indian Railway Service of Engineers (IRSE),
Indian Railways Accounts Service (IRAS),
Indian Railway Traffic Service (IRTS),
Indian Railway Service of Electrical Engineers (IRSEE),
Indian Railway Services of Signal Engineers (IRSSE),
Indian Railway Store Service (IRSS),
RPF Sub-Inspectors / Constables Examination
Loco pilot exam
station master exam
Junior clerk exam



But there are also many career option for bsc biotechnology .
Like
Professorship ,Research, Assistant Research, Assistant Manager, Manager of Biotech, Sales Manager - Lab , school teacher, etc


For more information you can visit here
https://www.careers360.com/courses/biotechnology-course

thank you . All the best hope this answer help you.