Will I be eligible to count my previous work experience junior engineer in Indian railways or not?

Indian Railways will be under the Indian government only. So the jobs in Railway are considered government jobs. But the rules and regulations of railway jobs are different from the other government jobs. They have their own board for recruitment and their procedures are different.
Now the point is whether your service will be counted if you get into a new job in other government jobs.
1. As far as PF is concerned, now all the employees are having UANs and even though there is a change in the job, your UAN will not change and the PF money will go into the same account and if you have to get EPF pension total years of contribution to PF will be taken for calculating your pension.
2. If your new job is eligible for a government pension while calculating the pension amount they will consider the years of service in direct government jobs but not the service you have in railways.
3. When you want to shift to another job definitely you can mention your experience in Railways. Total years of experience will include your experience in Railways also.
4. But your service register in a government job will not show your service in railways.

The following points would help you to understand the exact issues with which you are facing. You might see my points for better understanding of your position as a result of your changing over the jobs. The following are the points-
1) Currently you are working in Railway and have accumulated 2.5 years of experience. You would like to know whether this working experience can be clubbed with your joining in the government organisation. I am afraid that your experience of Railways would not be taken into account while computing the experience in your change over.
2) In respect of pension calculations as a result of joining your government organisation, your past experience of Railways would be covered for calculations sake and based upon number of years put in both the organisations, you would enjoy your pension benefits.
3) In case, you would like to have any change of your job in future, you can indicate total number of years of experience put in both the organisations. However, you should put the number of years of experience of each organisation separately for the better comprehension of your experience to the new employer.
4) In case, your transfer is again in the government organisation, your experience of Railways would be excluded while computing your experience.