Q: 49 (NDA-II/2017)

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The Indian Railways have gone in for qualitative improvements since independence.
Which of the following have taken place in recent years ?
1. Gauge conversion
2. Track electrification
3. Automatic signals
Select the correct answer using the codes given below ;
question_year: 
2017
question_exam: 
NDA-II
stats: 
0,16,8,0,8,0,16