Now you can get Railway tender online by accessing railway eprocurement website (https://www.ireps.gov.in/). You can search tender on this website by type of work, department, zone wise, tender id, active tenders closing today, all active tenders, custom search etc. But to apply (bid) for tender in indian railway, you need to register on IREPS website (https://www.ireps.gov.in/). 

1. To search indian railway tender, visit website : https://www.ireps.gov.in/epsn/anonymSearch.do?searchParam=showPageClosed&language=en 
2. To apply (Bid) tenders, you need to register on IREPS (www.ireps.gov.in/)
3. Before start your registration, you should gather all pre-requisite documents and other needs (https://groomix.info/Blogs/Problem-Resolved/Pre-requirements-for-vendor-registration-in-IREPS-indian-railway-e-procurement-system-)
4. Complete your computer system requirements for error free running of IREPS website
5. Before applying any tender, read all related documents carefully (Don't assume)
6. Earnest Money Deposition (EMD) is required in some of the tender and some tender exempted EMD upto some budgetary amount (so, you should read instruction before filling tender bids)
7. And lastly, your should work on this process in advance time because there is no certain time period to complete all above processes.