With your current qualification of Diploma in Metallurgy,you can't apply for Assistant Loco Pilot Job in Indian Railways as Diploma in following Engineering Courses are valid for this job.
Railway Recruitment Board recruits eligible candidates on the post of "Assistant Loco Pilot" in the pay scale of Rs 5200-20,200 with grade pay of Rs 1900/-, for its jurisdiction area through direct recruitment.The Assistant Loco Pilot get the higher posts in the sequence as described below through normal channel of promotion.
Assistant Loco Pilot
Shunting Loco Pilot
Goods Loco Pilot
Passenger Loco Pilot
Mail/Express Loco Pilot
Educational Qualification:-Matriculation or its equivalent under 10+2 system and course completed Act.Apprentice or I.T.I in any of the following specific trades recognized by SCVT/NCVT:
Mill Wright/Maintenance Mechanic
Mechanic Radio & T.V
Mechanic Motor Vehicle
Armature & Coil Winder
Refrigeration & A.C.Mechanic
orDiploma in above mentioned Engineering course recognized by AICTE in lieu of I.T.I
Age:-18 to 30 years
Selection Procedure/Stages of Exam
3)Document & Candidature Verification
For more information,Refer attached previous notification for recruitment of Assistant Loco Pilot.
You should continue your higher education i.e B.E/B.Tech Degree in Metallurgy/Mechanical from a AICTE Recognized College through lateral entry scheme by which you may apply for Metallurgy Assistant or various other posts in Indian Railways on the basis of degree in Metallurgy/Mechanical.
Hope the information helps you
Best of Luck